Add 中文(繁體) ("Chinese (Traditional)") localization

This will add a "中文(繁體)" option to the "Language" menu in the Arduino IDE preferences, which will cause the strings
in the IDE UI to be localized for "Chinese (Traditional)".

In addition to the translations for the strings that originate from the Eclipse Theia IDE framework provided by the
"Chinese (Traditional) Language Pack for Visual Studio Code" language pack, this will also utilize the translations of
the Arduino IDE-specific strings contributed by the community.

Author: coby2023t

arduino-ide-extension/src/node/i18n/arduino-localization-contribution.ts

@@ -23,6 +23,7 @@ export class ArduinoLocalizationContribution
     // ['id'], Does not have Transifex translations, but has a VS Code language pack available on Open VSX.
     ['it'],
     ['ja'],
+    ['zh-tw', 'zh-Hant'],    
     ['ko'],
     ['nl'],
     ['pl'],