diff --git a/po/R-zh_CN.po b/po/R-zh_CN.po
index 1aea5c3c4e..7422fa20f6 100644
--- a/po/R-zh_CN.po
+++ b/po/R-zh_CN.po
@@ -104,8 +104,7 @@ msgstr ""
 "因为其使用40字节来存储一个日期"
 
 #: as.data.table.R:181
-#, fuzzy, c-format
-#| msgid "has 0 rows but longest item has"
+#, c-format
 msgid "Item %d has %d rows but longest item has %d; recycled with remainder."
 msgstr "第 %d 项有 %d 行，但最长的一项只有 %d 行；将循环补齐剩余项。"
 
@@ -134,10 +133,7 @@ msgstr ""
 "POSIX 失败：%s"
 
 #: between.R:27
-#, fuzzy, c-format
-#| msgid ""
-#| "'between' lower= and upper= are both POSIXct but have different tzone "
-#| "attributes:"
+#, c-format
 msgid ""
 "'between' lower= and upper= are both POSIXct but have different tzone "
 "attributes: %s. Please align their time zones."
@@ -146,9 +142,7 @@ msgstr ""
 "（tzone）：%s。请将它们的时区调整一致。"
 
 #: between.R:31
-#, fuzzy, c-format
-#| msgid ""
-#| "'between' arguments are all POSIXct but have mismatched tzone attributes:"
+#, c-format
 msgid ""
 "'between' arguments are all POSIXct but have mismatched tzone attributes: "
 "%s. The UTC times will be compared."
@@ -374,10 +368,7 @@ msgid ""
 msgstr "变量 '%s' 并没有存在于调用环境中。之所以在调用环境中寻找是因为你使用了..的前缀.%s"
 
 #: data.table.R:282
-#, fuzzy, c-format
-#| msgid ""
-#| "' does exist in calling scope though, so please just removed the .. "
-#| "prefix from that variable name in calling scope."
+#, c-format
 msgid ""
 "Both '%1$s' and '..%1$s' exist in calling scope. Please remove the '..%1$s' "
 "variable in calling scope for clarity."
@@ -449,10 +440,7 @@ msgstr ""
 "确。运行 trackback()，和 debugger() 来获取发生错误的行号。"
 
 #: data.table.R:416
-#, fuzzy, c-format
-#| msgid ""
-#| "' is not found in calling scope. Looking in calling scope because you "
-#| "used the .. prefix."
+#, c-format
 msgid "'%s' is not found in calling scope and it is not a column name either"
 msgstr "'%s' 既不存在于调用环境中，也非列名。"
 
@@ -524,8 +512,7 @@ msgid "logical error. i is not a data.table, but 'on' argument is provided."
 msgstr "逻辑错误。当 i 并非一个 data.table时，不应提供'on'参数"
 
 #: data.table.R:601
-#, fuzzy, c-format
-#| msgid ". Expecting logical, integer or double."
+#, c-format
 msgid "i has evaluated to type %s. Expecting logical, integer or double."
 msgstr "经计算 i 为 %s 类型。需要布尔类型，整型或浮点型。"
 
@@ -539,11 +526,7 @@ msgstr ""
 "（issue tracker）"
 
 #: data.table.R:623
-#, fuzzy, c-format
-#| msgid ""
-#| "rows. Recycling of logical i is no longer allowed as it hides more bugs "
-#| "than is worth the rare convenience. Explicitly use rep(...,length=.N) if "
-#| "you really need to recycle."
+#, c-format
 msgid ""
 "i evaluates to a logical vector length %d but there are %d rows. Recycling "
 "of logical i is no longer allowed as it hides more bugs than is worth the "
@@ -596,8 +579,7 @@ msgid "column(s) not found: %s"
 msgstr "列不存在: %s"
 
 #: data.table.R:746
-#, fuzzy, c-format
-#| msgid "which is outside the column number range [1,ncol="
+#, c-format
 msgid "Item %d of j is %d which is outside the column number range [1,ncol=%d]"
 msgstr "j 中的第 %d 项的数值为 %d，已超出列索引的范围内1,ncol=%d]"
 
@@ -627,12 +609,7 @@ msgid "by=c(...), key(...) or names(...) must evaluate to 'character'"
 msgstr "by=c(...), key(...) 或 names(...) 只接受 'character' "
 
 #: data.table.R:805
-#, fuzzy, c-format
-#| msgid ""
-#| "but one or more items include a comma. Either pass a vector of column "
-#| "names (which can contain spaces, but no commas), or pass a vector length "
-#| "1 containing comma separated column names. See ?data.table for other "
-#| "possibilities."
+#, c-format
 msgid ""
 "'by' is a character vector length %d but one or more items include a comma. "
 "Either pass a vector of column names (which can contain spaces, but no "
@@ -653,10 +630,7 @@ msgid "Internal error: irows isn't integer"
 msgstr "内部错误：irows 不是整型"
 
 #: data.table.R:887
-#, fuzzy, c-format
-#| msgid ""
-#| "'by' appears to evaluate to column names but isn't c() or key(). Use "
-#| "by=list(...) if you can. Otherwise, by=eval"
+#, c-format
 msgid ""
 "'by' appears to evaluate to column names but isn't c() or key(). Use "
 "by=list(...) if you can. Otherwise, by=eval%s should work. This is for "
@@ -845,8 +819,7 @@ msgstr ""
 "的長度是 %d"
 
 #: data.table.R:1207
-#, fuzzy, c-format
-#| msgid "' not found in names of list"
+#, c-format
 msgid "Internal error -- item '%s' not found in names of list"
 msgstr "内部错误 -- 未能在列表名称中找到名为 '%s' 的项"
 
@@ -868,10 +841,7 @@ msgstr ""
 "as.POSIXct() 以避免本警告 (此函数会根据需求在内部调用 strptime())"
 
 #: data.table.R:1278
-#, fuzzy, c-format
-#| msgid ""
-#| "' is not found in calling scope. Looking in calling scope because this "
-#| "symbol was prefixed with .. in the j= parameter."
+#, c-format
 msgid ""
 "Variable '%s' is not found in calling scope. Looking in calling scope "
 "because this symbol was prefixed with .. in the j= parameter."
@@ -978,8 +948,7 @@ msgstr ""
 "`keyby=`现有的列名"
 
 #: data.table.R:1950
-#, fuzzy, c-format
-#| msgid "Internal error: jvnames is length"
+#, c-format
 msgid "Internal error: jvnames is length %d but ans is %d and bynames is %d"
 msgstr "内部错误：jvnames 长度为 %d，但是 ans 长度为 %d 且 bynames 为 %d"
 
@@ -1003,8 +972,7 @@ msgstr ""
 "行名长度为零，`length(rownames)==0`，但应该为单一列名，单一数值，或NULL"
 
 #: data.table.R:2033
-#, fuzzy, c-format
-#| msgid "rownames is TRUE but key has multiple columns"
+#, c-format
 msgid ""
 "rownames is TRUE but key has multiple columns %s; taking first column x[,1] "
 "as rownames"
@@ -1086,8 +1054,7 @@ msgid "data.tables do not have rownames"
 msgstr "data.tables没有rownames"
 
 #: data.table.R:2248 data.table.R:2626
-#, fuzzy, c-format
-#| msgid "Can not cast an empty data.table"
+#, c-format
 msgid "Can't assign %d names to a %d-column data.table"
 msgstr "无法将 %d 个名字赋值给一个包含 %d 列的 data.table"
 
@@ -1182,8 +1149,7 @@ msgid "x has %d columns but its names are length %d"
 msgstr "x有%d列，但其列名的长度为%d"
 
 #: data.table.R:2625
-#, fuzzy, c-format
-#| msgid "'. Needs to be type 'character'."
+#, c-format
 msgid "Passed a vector of type '%s'. Needs to be type 'character'."
 msgstr "传入了一个类型为 '%s' 的向量。须为 'character' 类型。"
 
@@ -1203,8 +1169,7 @@ msgid "Some duplicates exist in 'old': %s"
 msgstr "在'old' 中存在重复名称: %s"
 
 #: data.table.R:2643
-#, fuzzy, c-format
-#| msgid "but should be integer, double or character"
+#, c-format
 msgid "'old' is type %s but should be integer, double or character"
 msgstr "'old' 为 %s 类型，但只接受整型、浮点型或者字符串型"
 
@@ -1219,10 +1184,7 @@ msgid "NA (or out of bounds) in 'old' at positions %s"
 msgstr "NA(或超出界限)出现在'old' 的位置 %s"
 
 #: data.table.R:2648
-#, fuzzy, c-format
-#| msgid ""
-#| "' which appears several times in column names. Just the first will be "
-#| "changed. There are"
+#, c-format
 msgid ""
 "Item %d of 'old' is '%s' which appears several times in column names. Just "
 "the first will be changed. There are %d other items in 'old' that are also "
@@ -1231,8 +1193,7 @@ msgstr "'old' 中的第 %d 项 '%s' 在列名中重复出现。仅第一个会
 "中仍有 %d 项在列名中重复出现。"
 
 #: data.table.R:2656
-#, fuzzy, c-format
-#| msgid "Items of 'old' not found in column names:"
+#, c-format
 msgid ""
 "Items of 'old' not found in column names: %s. Consider skip_absent=TRUE."
 msgstr "在 'old' 中未找到如下列名：%s。请考虑设置 skip_absent=TRUE。"
@@ -1243,8 +1204,7 @@ msgid "Internal error: length(i)!=length(new)"
 msgstr "内部错误:length(i)!=length(new)"
 
 #: data.table.R:2695
-#, fuzzy, c-format
-#| msgid ". Please remove or rename the duplicate(s) and try again."
+#, c-format
 msgid ""
 "x has some duplicated column name(s): %s. Please remove or rename the "
 "duplicate(s) and try again."
@@ -1324,11 +1284,7 @@ msgid "Cannot find symbol %s"
 msgstr "无法找到符号 %s"
 
 #: data.table.R:2849
-#, fuzzy, c-format
-#| msgid ""
-#| "' resides within a package (or an environment) that is locked to prevent "
-#| "modifying its variable bindings. Try copying the object to your current "
-#| "environment, ex: var <- copy(var) and then using setDT again."
+#, c-format
 msgid ""
 "Cannot convert '%1$s' to data.table by reference because binding is locked. "
 "It is very likely that '%1$s' resides within a package (or an environment) "
@@ -1342,11 +1298,7 @@ msgstr ""
 "然后再运行 setDT。"
 
 #: data.table.R:2856
-#, fuzzy, c-format
-#| msgid ""
-#| ". setDT will retain these columns as-is but subsequent operations like "
-#| "grouping and joining may fail. Please consider as.data.table() instead "
-#| "which will create a new column for each embedded column."
+#, c-format
 msgid ""
 "Some columns are a multi-column type (such as a matrix column): %s. setDT "
 "will retain these columns as-is but subsequent operations like grouping and "
@@ -1358,11 +1310,7 @@ msgstr ""
 "为它会为每个内嵌列建立一个新列。"
 
 #: data.table.R:2888
-#, fuzzy, c-format
-#| msgid ""
-#| "is of POSIXlt type. Please convert it to POSIXct using as.POSIXct and run "
-#| "setDT again. We do not recommend use of POSIXlt at all because it uses 40 "
-#| "bytes to store one date."
+#, c-format
 msgid ""
 "Column %d is of POSIXlt type. Please convert it to POSIXct using as.POSIXct "
 "and run setDT again. We do not recommend use of POSIXlt at all because it "
@@ -1372,10 +1320,7 @@ msgstr ""
 "setDT。我们非常不推荐使用 POSIXlt 类型，因为它需使用 40 个字节来存储一个日期。"
 
 #: data.table.R:2894
-#, fuzzy, c-format
-#| msgid ""
-#| "All elements in argument 'x' to 'setDT' must be of same length, but the "
-#| "profile of input lengths (length:frequency) is:"
+#, c-format
 msgid ""
 "All elements in argument 'x' to 'setDT' must be of same length, but the "
 "profile of input lengths (length:frequency) is: %s\n"
@@ -1394,8 +1339,7 @@ msgstr ""
 "table'"
 
 #: data.table.R:2926
-#, fuzzy, c-format
-#| msgid "' not found in names of input list"
+#, c-format
 msgid "Item '%s' not found in names of input list"
 msgstr "元素 '%s' 不存在于输入列表的元素名中"
 
@@ -1439,8 +1383,7 @@ msgstr ""
 "些列联接。"
 
 #: data.table.R:3248
-#, fuzzy, c-format
-#| msgid "Found more than one operator in one 'on' statement:"
+#, c-format
 msgid ""
 "Found more than one operator in one 'on' statement: %s. Please specify a "
 "single operator."
@@ -1448,24 +1391,21 @@ msgstr "在一个 'on' 语句中出现了多个操作符（operator）：%s。
 "符。"
 
 #: data.table.R:3271
-#, fuzzy, c-format
-#| msgid ". Each 'on' clause must contain one or two column names."
+#, c-format
 msgid ""
 "'on' contains no column name: %s. Each 'on' clause must contain one or two "
 "column names."
 msgstr "'on' 语句中包含非列名的项：%s。每个'on' 语句中必须包含一个或两个列名。"
 
 #: data.table.R:3273
-#, fuzzy, c-format
-#| msgid ". Each 'on' clause must contain one or two column names."
+#, c-format
 msgid ""
 "'on' contains more than 2 column names: %s. Each 'on' clause must contain "
 "one or two column names."
 msgstr "'on' 语句包含超过 2 个列名：%s。每个'on' 语句中必须包含一个或两个列名。"
 
 #: data.table.R:3278
-#, fuzzy, c-format
-#| msgid ". Only allowed operators are"
+#, c-format
 msgid "Invalid join operators %s. Only allowed operators are %s."
 msgstr "无效联接操作符 %s。只允许如下操作符: %s。"
 
@@ -1504,11 +1444,7 @@ msgstr ""
 "该包，但请注意 reshape2 已被其它包取代且不再积极开发。"
 
 #: fcast.R:21
-#, fuzzy, c-format
-#| msgid ""
-#| "and will attempt to redirect to the reshape2::dcast; please note that "
-#| "reshape2 is deprecated, and this redirection is now deprecated as well. "
-#| "Please do this redirection yourself like reshape2::dcast("
+#, c-format
 msgid ""
 "The %1$s generic in data.table has been passed a %2$s and will attempt to "
 "redirect to the relevant reshape2 method; please note that reshape2 is "
@@ -1534,8 +1470,7 @@ msgid "data.table to cast must have unique column names"
 msgstr "要转换的data.table必须具有唯一的列名"
 
 #: fcast.R:60
-#, fuzzy, c-format
-#| msgid "] are not found in 'data'."
+#, c-format
 msgid "value.var values %s are not found in 'data'."
 msgstr "value.var 的值 %s 无法在 'data' 中找到。"
 
@@ -1591,13 +1526,7 @@ msgid "Internal error -- empty rhsnames in dcast; please report"
 msgstr "内部错误：dcast 中 rhsnames 为空；请报告"
 
 #: fmelt.R:17
-#, fuzzy, c-format
-#| msgid ""
-#| "and will attempt to redirect to the relevant reshape2 method; please note "
-#| "that reshape2 is deprecated, and this redirection is now deprecated as "
-#| "well. To continue using melt methods from reshape2 while both libraries "
-#| "are attached, e.g. melt.list, you can prepend the namespace like "
-#| "reshape2::melt("
+#, c-format
 msgid ""
 "The %1$s generic in data.table has been passed a %2$s and will attempt to "
 "redirect to the relevant reshape2 method; please note that reshape2 is "
@@ -1618,8 +1547,7 @@ msgid "Input patterns must be of type character."
 msgstr "输入的 patterns 必须是字符类型。"
 
 #: fmelt.R:32
-#, fuzzy, c-format
-#| msgid "column(s) not found:"
+#, c-format
 msgid "Pattern(s) not found: [%s]"
 msgstr "未找到下列 pattern：[%s]"
 
@@ -1661,9 +1589,7 @@ msgid "multiple.keyword must be a character string with nchar>0"
 msgstr "multiple.keyword 必须为一个字符长度大于0(nchar>0)的字符串
 
 #: fmelt.R:80
-#, fuzzy, c-format
-#| msgid ""
-#| "Argument 'by' must be a character vector of column names used in grouping."
+#, c-format
 msgid "cols must be a character vector of column names"
 msgstr "cols 必须是一个由列名组成的字符串向量"
 
@@ -1683,8 +1609,7 @@ msgid "number of %s =%d must be same as %s =%d"
 msgstr "%s 的数量 =%d 必须与 %s 的数量 =%d 相同"
 
 #: fmelt.R:106
-#, fuzzy, c-format
-#| msgid "but must be character."
+#, c-format
 msgid "pattern must be character string"
 msgstr "pattern 必须是一个字符串"
 
@@ -1704,8 +1629,7 @@ msgstr ""
 "pattern 必须包含至少一个捕获组（括号子模式）"
 
 #: fmelt.R:123
-#, fuzzy, c-format
-#| msgid "but must be character."
+#, c-format
 msgid "sep must be character string"
 msgstr "sep 必须是一个字符串"
 
@@ -1869,9 +1793,7 @@ msgid "A non-empty vector of column names or numbers is required for by.y"
 msgstr "'by.y'应该是具有列名或者数字非空向量"
 
 #: foverlaps.R:40
-#, fuzzy, c-format
-#| msgid ""
-#| "columns of y's key must be identical to the columns specified in by.y."
+#, c-format
 msgid ""
 "The first %d columns of y's key must be identical to the columns specified "
 "in by.y."
@@ -1897,8 +1819,7 @@ msgid ""
 msgstr "当by.x的长度不等于by.y时。by.x中指定的列应该与by.y中指定的列等长。"
 
 #: foverlaps.R:48 foverlaps.R:50 merge.R:26 merge.R:27
-#, fuzzy, c-format
-#| msgid ". Please remove or rename the duplicate(s) and try again."
+#, c-format
 msgid ""
 "%s has some duplicated column name(s): %s. Please remove or rename the "
 "duplicate(s) and try again."
@@ -1914,10 +1835,7 @@ msgstr ""
 "数字类型"
 
 #: foverlaps.R:60 foverlaps.R:62 foverlaps.R:69 foverlaps.R:71
-#, fuzzy, c-format
-#| msgid ""
-#| "'. All rows with NA values in the range columns must be removed for "
-#| "foverlaps() to work."
+#, c-format
 msgid ""
 "NA values in data.table %s '%s' column: '%s'. All rows with NA values in the "
 "range columns must be removed for foverlaps() to work."
@@ -1942,8 +1860,7 @@ msgstr ""
 "数字类型"
 
 #: foverlaps.R:72
-#, fuzzy, c-format
-#| msgid "should be <= corresponding entries in column"
+#, c-format
 msgid ""
 "All entries in column '%s' should be <= corresponding entries in column '%s' "
 "in data.table y."
@@ -2029,8 +1946,7 @@ msgid "Argument 'encoding' must be 'unknown', 'UTF-8' or 'Latin-1'."
 msgstr "参数 'encoding' 必须为 'unknown', 'UTF-8' 或 'Latin-1'."
 
 #: fread.R:40
-#, fuzzy, c-format
-#| msgid "but must be character."
+#, c-format
 msgid "'text=' is type %s but must be character."
 msgstr "'text=' 为 %s 类型，但需要其必须为字符串类型。"
 
@@ -2056,14 +1972,7 @@ msgstr ""
 "file= 或 cmd="
 
 #: fread.R:62
-#, fuzzy, c-format
-#| msgid ""
-#| "') and a variable has been used in the expression passed to `input=`. "
-#| "Please use fread(cmd=...). There is a security concern if you are "
-#| "creating an app, and the app could have a malicious user, and the app is "
-#| "not running in a secure environment; e.g. the app is running as root. "
-#| "Please read item 5 in the NEWS file for v1.11.6 for more information and "
-#| "for the option to suppress this message."
+#, c-format
 msgid ""
 "Taking input= as a system command because it contains a space ('%s'). If "
 "it's a filename please remove the space, or use file= explicitly. A variable "
@@ -2081,12 +1990,7 @@ msgstr ""
 "文件里面的第 5 条。"
 
 #: fread.R:75
-#, fuzzy, c-format
-#| msgid ""
-#| "input= must be a single character string containing a file name, a system "
-#| "command containing at least one space, a URL starting 'http[s]://', "
-#| "'ftp[s]://' or 'file://', or, the input data itself containing at least "
-#| "one \\n or \\r"
+#, c-format
 msgid ""
 "file= must be a single character string containing a filename, or URL "
 "starting 'http[s]://', 'ftp[s]://' or 'file://'"
@@ -2230,10 +2134,7 @@ msgstr ""
 "（有效的开头应符合正则表达式 \"%s\"）；请检查你的输入并重试。"
 
 #: fread.R:193
-#, fuzzy, c-format
-#| msgid ""
-#| "Reached the end of the file before finding a completion to the YAML "
-#| "header. A valid YAML header is bookended by lines matching"
+#, c-format
 msgid ""
 "Reached the end of the file before finding a completion to the YAML header. "
 "A valid YAML header is bookended by lines matching the regex \"%s\". Please "
@@ -2354,8 +2255,7 @@ msgid "x being coerced from class: matrix to data.table"
 msgstr "x 的类将强制从 matrix 转变为 data.table"
 
 #: fwrite.R:79
-#, fuzzy, c-format
-#| msgid "with an empty one, please use file.remove first."
+#, c-format
 msgid ""
 "If you intended to overwrite the file at %s with an empty one, please use "
 "file.remove first."
@@ -2367,8 +2267,7 @@ msgid "Input has no columns; doing nothing.%s"
 msgstr "输入没有列，不执行任何操作。%s"
 
 #: fwrite.R:83
-#, fuzzy, c-format
-#| msgid "Input has no columns; creating an empty file at '"
+#, c-format
 msgid "Input has no columns; creating an empty file at '%s' and exiting."
 msgstr "输入中没有任何列，将创建一个空文件 '%s' 并退出。"
 
@@ -2447,11 +2346,7 @@ msgid ""
 msgstr "在单个分组中，'sets' 列表中的字符串向量不能有重复的列名。"
 
 #: groupingsets.R:68
-#, fuzzy, c-format
-#| msgid ""
-#| "; as such, there will be duplicate rows in the output -- note that "
-#| "grouping by A,B and B,A will produce the same aggregations. Use "
-#| "`sets=unique(lapply(sets, sort))` to eliminate duplicates."
+#, c-format
 msgid ""
 "'sets' contains a duplicate (i.e., equivalent up to sorting) element at "
 "index %d; as such, there will be duplicate rows in the output -- note that "
@@ -2509,14 +2404,12 @@ msgid "Argument 'no.dups' should be logical TRUE/FALSE"
 msgstr "参数 'no.dups' 应为逻辑值 TRUE 或 FALSE"
 
 #: merge.R:18
-#, fuzzy, c-format
-#| msgid "Input data.table must not contain duplicate column names."
+#, c-format
 msgid "Neither of the input data.tables to join have columns."
 msgstr "用于联接的 data.table 输入中均不包含任何列。"
 
 #: merge.R:20 merge.R:22
-#, fuzzy, c-format
-#| msgid "Input data.table must not contain duplicate column names."
+#, c-format
 msgid "Input data.table '%s' has no columns."
 msgstr "输入的 data.table '%s' 没有任何列。"
 
@@ -2713,8 +2606,7 @@ msgstr ""
 "仅是在data.table中。只是data.table添加了这个检查"
 
 #: onLoad.R:30
-#, fuzzy, c-format
-#| msgid ". The major version must match. Please reinstall data.table."
+#, c-format
 msgid ""
 "This is R %s but data.table has been installed using R %s. The major version "
 "must match. Please reinstall data.table."
@@ -2846,11 +2738,7 @@ msgid ""
 msgstr "x可能不再是data.table的名字。 该变化不被记录并且已经被删除"
 
 #: setkey.R:23
-#, fuzzy, c-format
-#| msgid ""
-#| "key(x)<-value is deprecated and not supported. Please change to use "
-#| "setkey() with perhaps copy(). Has been warning since 2012 and will be an "
-#| "error in future."
+#, c-format
 msgid ""
 "key(x)<-value is deprecated and not supported. Please change to use setkey() "
 "with perhaps copy(). Has been warning since 2012."
@@ -2910,8 +2798,7 @@ msgid ""
 msgstr "x包含一个叫做'.xi'的列。这与data.table中使用的内部名称冲突"
 
 #: setkey.R:76
-#, fuzzy, c-format
-#| msgid "' which is not supported as a key column type, currently."
+#, c-format
 msgid ""
 "Column '%s' is type '%s' which is not supported as a key column type, "
 "currently."
@@ -2925,8 +2812,7 @@ msgid ""
 msgstr "内部错误： 目前在setkey中，'cols'应该是字符类型, 请报告"
 
 #: setkey.R:125
-#, fuzzy, c-format
-#| msgid "Internal error: byindex not the index name"
+#, c-format
 msgid "Internal error: index '%s' exists but is invalid"
 msgstr "内部错误 : 索引 '%s' 虽存在，但是无效"
 
@@ -3010,14 +2896,12 @@ msgstr ""
 "包裹以阻止该警告。"
 
 #: setkey.R:285
-#, fuzzy, c-format
-#| msgid "' which is not supported for ordering currently."
+#, c-format
 msgid "Column '%s' is type '%s' which is not supported for ordering currently."
 msgstr "列 '%s' 为 '%s' 类型，目前尚不支持使用该类型排序。"
 
 #: setkey.R:329
-#, fuzzy, c-format
-#| msgid "is non-atomic, which can't be sorted; try setting sorted = FALSE"
+#, c-format
 msgid ""
 "'sorted' is TRUE but element %d is non-atomic, which can't be sorted; try "
 "setting sorted = FALSE"
@@ -3090,8 +2974,7 @@ msgid "unsupported column type(s) found in x or y: %s"
 msgstr "找到不支持的列类型在 x 或 y: %s"
 
 #: setops.R:53
-#, fuzzy, c-format
-#| msgid "' but the corresponding item of y is '"
+#, c-format
 msgid "Item %d of x is '%s' but the corresponding item of y is '%s'."
 msgstr "x 中的第 %d 项为 '%s'，而 y 中对应的项为 '%s'。"
 
@@ -3206,15 +3089,12 @@ msgid ""
 msgstr ""
 
 #: test.data.table.R:176
-#, fuzzy, c-format
-#| msgid "before the next test() call in"
+#, c-format
 msgid "Failed in %s after test %s before the next test() call in %s"
 msgstr "测试于 %s 后失败，失败发生在测试 %s 之后、下一 test() 之前、调用 %s 时"
 
 #: test.data.table.R:186
-#, fuzzy, c-format
-#| msgid "%d error out of %d. Search %s for test number %s"
-#| msgid_plural "%d errors out of %d. Search %s for test numbers %s"
+#, c-format
 msgid "%d error(s) out of %d. Search %s for test number(s) %s. Duration: %s."
 msgstr "%2$d 中共产生 %1$d 个错误。搜索 %s 以定位测试编号 %s。用时：%s。"
 
diff --git a/po/zh_CN.po b/po/zh_CN.po
index 34e22b3e69..443bc5410e 100644
--- a/po/zh_CN.po
+++ b/po/zh_CN.po
@@ -480,8 +480,7 @@ msgid "target vector"
 msgstr "目标向量"
 
 #: assign.c:690
-#, fuzzy, c-format
-#| msgid "Column %d of item %d: %s"
+#, c-format
 msgid "column %d named '%s'"
 msgstr "第 %d 列名为 '%s'"
 
@@ -566,8 +565,7 @@ msgid "Coercing 'list' RHS to '%s' to match the type of %s."
 msgstr "将'list' RHS 强制转换成 '%s' 来匹配目 %s 的类型"
 
 #: assign.c:856
-#, fuzzy, c-format
-#| msgid "Zero-copy coerce when assigning '%s' to '%s' column %d named '%s'.\n"
+#, c-format
 msgid "Zero-copy coerce when assigning '%s' to '%s' %s.\n"
 msgstr "在 %s 中将 '%s' 赋值成 '%s' 时发生了零拷贝强制转换。\n"
 
@@ -785,14 +783,10 @@ msgid "rollends must be a length 2 logical vector"
 msgstr "rollends 必须是一个长度为2的逻辑向量"
 
 #: bmerge.c:92
-#, fuzzy
-#| msgid "Internal error: issorted 'by' must be NULL or integer vector"
 msgid "Internal error: nomatchArg must be NULL or length-1 logical/integer"
 msgstr "内部错误：nomatchArg 须为 NULL 或一长度为 1 的逻辑/整形变量"
 
 #: bmerge.c:95
-#, fuzzy
-#| msgid "Internal error: nqgrpArg must be an integer vector"
 msgid "Internal error: nomatchArg must be NULL, NA, NA_integer_ or 0L"
 msgstr "内部错误：nomatchArg 须为 NULL、NA、NA_integer_ 或 0L"
 
@@ -1246,20 +1240,14 @@ msgid ""
 msgstr "'na'长度是%<PRId64>但长度必须是1或者等于'test'的长度 (%<PRId64>)。"
 
 #: fifelse.c:46
-#, fuzzy, c-format
-#| msgid ""
-#| "'yes' is of type %s but 'no' is of type %s. Please make sure that both "
-#| "arguments have the same type."
+#, c-format
 msgid ""
 "'no' is of type %s but '%s' is %s. Please make all arguments have the same "
 "type."
 msgstr "'no' 是 %s 类型，但 'no' 是 %s 类型。请确保所有参数为同一类型。"
 
 #: fifelse.c:52
-#, fuzzy, c-format
-#| msgid ""
-#| "'yes' is of type %s but 'na' is of type %s. Please make sure that both "
-#| "arguments have the same type."
+#, c-format
 msgid ""
 "'na' is of type %s but '%s' is %s. Please make all arguments have the same "
 "type."
@@ -1536,8 +1524,7 @@ msgid "Internal error: fmelt.c:getvarcols %d %d"
 msgstr "内部错误：fmelt.c : getvarcols %d %d"
 
 #: fmelt.c:679
-#, fuzzy, c-format
-#| msgid "Unknown column type '%s' for column '%s'."
+#, c-format
 msgid "variable_table does not support column type '%s' for column '%s'."
 msgstr "variable_table 不支持列 '%2$s' 所包含的数据类型 '%1$s'。"
 
@@ -1697,8 +1684,7 @@ msgid "internal error: 'by' value %d out of range [1,%d]"
 msgstr "内部错误：参数 'by' 的值%d超出[1，%d]的范围"
 
 #: forder.c:455
-#, fuzzy, c-format
-#| msgid "Column %d is length %d which differs from length of column 1 (%d)\n"
+#, c-format
 msgid ""
 "Column %d is length %d which differs from length of column 1 (%d), are you "
 "attempting to order by a list column?\n"
@@ -1920,10 +1906,7 @@ msgid ""
 msgstr "freadMain: NAstring <<%s>> 被识别为布尔型，这是不允许"
 
 #: fread.c:1298
-#, fuzzy, c-format
-#| msgid ""
-#| "freadMain: NAstring <<%s>> is recognized as type boolean, this is not "
-#| "permitted."
+#, c-format
 msgid "freadMain: NAstring <<%s>> and logical01=TRUE, this is not permitted."
 msgstr "freadMain: NAstring 为 <<%s>> 同时 logical01=TRUE，不允许这种情况。"
 
@@ -2570,10 +2553,7 @@ msgid "Internal error: Master thread is not thread 0 but thread %d.\n"
 msgstr "内部错误：主线程并非线程0而是线程%d\n"
 
 #: fread.c:2386
-#, fuzzy, c-format
-#| msgid ""
-#| "Column %d (\"%.*s\") bumped from '%s' to '%s' due to <<%.*s>> on row "
-#| "%<PRIu64>\n"
+#, c-format
 msgid ""
 "Column %d%s%.*s%s bumped from '%s' to '%s' due to <<%.*s>> on row %<PRIu64>\n"
 msgstr ""
@@ -2729,9 +2709,6 @@ msgstr ""
 "被捕获。"
 
 #: freadR.c:90
-#, fuzzy
-#| msgid ""
-#| "Internal error in coalesce.c: argument 'inplaceArg' must be TRUE or FALSE"
 msgid "Internal error: freadR isFileNameArg not TRUE or FALSE"
 msgstr "内部错误：freadR 中 isFileNameArg 并非 TRUE 或 FALSE"
 
@@ -2759,9 +2736,6 @@ msgid "quote= must be a single character, blank \"\", or FALSE"
 msgstr "quote= 必须是单个字符，空白 \"\"，或者 FALSE"
 
 #: freadR.c:125
-#, fuzzy
-#| msgid ""
-#| "Internal error: freadR sep not a single character. R level catches this."
 msgid "Internal error: freadR nrows not a single real. R level catches this."
 msgstr "内部错误：freadR nrows 并非为一单一实数。R 中应该捕获此错误。"
 
@@ -3044,8 +3018,6 @@ msgid "%s: took %.3fs\n"
 msgstr "%s: 使用了 %.3fs\n"
 
 #: frollR.c:17
-#, fuzzy
-#| msgid "x must be list, data.frame or data.table of numeric or logical types"
 msgid ""
 "x must be of type numeric or logical, or a list, data.frame or data.table of "
 "such"
@@ -3084,10 +3056,7 @@ msgstr ""
 "TRUE, 在其他情况可以让它保留默认值NA"
 
 #: frollR.c:109 frollR.c:141 frollR.c:163 frollR.c:253 nafill.c:170
-#, fuzzy, c-format
-#| msgid ""
-#| "Internal error: invalid type argument in nafillR function, should have "
-#| "been caught before. Please report to data.table issue tracker."
+#, c-format
 msgid ""
 "Internal error: invalid %s argument in %s function should have been caught "
 "earlier. Please report to the data.table issue tracker."
@@ -3619,10 +3588,7 @@ msgid "Unable to allocate %d * %zu bytes for non-NA counts in gmean na.rm=TRUE"
 msgstr "无法为 gmean na.rm=TRUE 的不 NA 计数（counts）分配 %d * %zu 字节空间"
 
 #: gsumm.c:712
-#, fuzzy, c-format
-#| msgid ""
-#| "Type '%s' not supported by GForce min (gmin). Either add the prefix base::"
-#| "min(.) or turn off GForce optimization using options(datatable.optimize=1)"
+#, c-format
 msgid ""
 "Type '%s' not supported by GForce mean (gmean). Either add the prefix base::"
 "mean(.) or turn off GForce optimization using options(datatable.optimize=1)"
@@ -3631,12 +3597,6 @@ msgstr ""
 "者使用 options(datatable.optimize=1) 关闭 GForce 优化"
 
 #: gsumm.c:724
-#, fuzzy
-#| msgid ""
-#| "GForce min can only be applied to columns, not .SD or similar. To find "
-#| "min of all items in a list such as .SD, either add the prefix base::min(."
-#| "SD) or turn off GForce optimization using options(datatable.optimize=1). "
-#| "More likely, you may be looking for 'DT[,lapply(.SD,min),by=,.SDcols=]'"
 msgid ""
 "GForce min/max can only be applied to columns, not .SD or similar. To find "
 "min/max of all items in a list such as .SD, either add the prefix base::min(."
@@ -3649,8 +3609,6 @@ msgstr ""
 "要使用的命令是 'DT[,lapply(.SD,median),by=,.SDcols=]'"
 
 #: gsumm.c:835
-#, fuzzy
-#| msgid "Type 'complex' has no well-defined min"
 msgid "Type 'complex' has no well-defined min/max"
 msgstr "'complex' 类型没有明确定义的最小值/最大值"
 
@@ -3668,8 +3626,6 @@ msgstr ""
 "的命令是 'DT[,lapply(.SD,median),by=,.SDcols=]'"
 
 #: gsumm.c:919
-#, fuzzy
-#| msgid "Internal error: either chin or chmatchdup should be true not both"
 msgid "Internal error: gfirstlast headw should only be true when w>1"
 msgstr "内部错误：gfirstlast 中的 headw 参数在当 w>1 时应只能为真"
 
@@ -3679,11 +3635,7 @@ msgid "Internal error: unanticipated case in gfirstlast first=%d w=%d headw=%d"
 msgstr "内部错误：未预料到 gfirstlast 中的 first=%d w=%d headw=%d 这种情况
 
 #: gsumm.c:979
-#, fuzzy, c-format
-#| msgid ""
-#| "Type '%s' not supported by GForce head (ghead). Either add the prefix "
-#| "utils::head(.) or turn off GForce optimization using options(datatable."
-#| "optimize=1)"
+#, c-format
 msgid ""
 "Type '%s' is not supported by GForce head/tail/first/last/`[`. Either add "
 "the namespace prefix (e.g. utils::head(.)) or turn off GForce optimization "
@@ -3762,10 +3714,7 @@ msgid "Item %d of n is NA"
 msgstr "n 的第 %d 项是NA"
 
 #: gsumm.c:1266
-#, fuzzy, c-format
-#| msgid ""
-#| "Type '%s' not supported by GForce sd (gsd). Either add the prefix stats::"
-#| "sd(.) or turn off GForce optimization using options(datatable.optimize=1)"
+#, c-format
 msgid ""
 "Type '%s' is not supported by GForce gshift. Either add the namespace prefix "
 "(e.g. data.table::shift(.)) or turn off GForce optimization using "
@@ -3981,8 +3930,6 @@ msgid "PRINTNAME(install(\"integer64\")) has returned %s not %s"
 msgstr "PRINTNAME(install(\"integer64\")) 返回了 %s , 而不是 %s"
 
 #: init.c:318
-#, fuzzy
-#| msgid "rollends must be a length 2 logical vector"
 msgid "verbose option must be length 1 non-NA logical or integer"
 msgstr "verbose 选项必须为一个长度为 1 的非 NA 逻辑值或整数"
 
@@ -4005,14 +3952,10 @@ msgid "'x' argument must be numeric type, or list/data.table of numeric types"
 msgstr "参数'x'必须是数字类型，或者是数字类型的list/data.table"
 
 #: nafill.c:179
-#, fuzzy
-#| msgid "fill must be a vector of length 1"
 msgid "fill must be a vector of length 1 or a list of length of x"
 msgstr "fill 必须是一个长度为 1 的向量或长度为 x 的列表"
 
 #: nafill.c:187
-#, fuzzy
-#| msgid "internal error: 'rho' should be an environment"
 msgid "internal error: 'fill' should be recycled as list already"
 msgstr "内部错误: 'fill' 应该已被循环补齐为一个列表"
 
@@ -4537,9 +4480,7 @@ msgid ""
 msgstr "%d ['%s'] 长度为 %d ，而列 1 的长度为 %d ；data.table 格式错误。"
 
 #: subset.c:290
-#, fuzzy, c-format
-#| msgid ""
-#| "Item %d of 'cols' is %d which is outside 1-based range [1,ncol(x)=%d]"
+#, c-format
 msgid "Item %d of cols is %d which is outside the range [1,ncol(x)=%d]"
 msgstr "'cols' 的 第 %d 项为 %d ，超出范围 [1,ncol(x)=%d]"
 
@@ -4680,8 +4621,7 @@ msgid "argument specifying columns received duplicate column(s)"
 msgstr "指定列的参数受到了重复的列"
 
 #: utils.c:229
-#, fuzzy, c-format
-#| msgid "Internal error: type '%s' not caught earlier in fastmean"
+#, c-format
 msgid "Internal error: type '%s' not supported in %s"
 msgstr "内部错误：类型 '%s' 不支持应用 %s"
 
@@ -4696,8 +4636,6 @@ msgid "Found and copied %d column%s with a shared memory address\n"
 msgstr "发现并拷贝了具有相同的内存地址的%d列%s\n"
 
 #: utils.c:358
-#, fuzzy
-#| msgid "x is not a logical vector"
 msgid "'x' is not atomic"
 msgstr "x 不是一个原子向量"