Update nl.json

[Stephan-P]

Further Dutch improvements.

Conundrum: To share vs. a share
'A share' can be a shared space or folder (singular but implicitly plural) or a shared file (singular) I decided to keep 'a share' untranslated and to translate the verbal 'to share', 'shared', etc. with the verbal "delen", "gedeeld", etc.

[johaven]

Thank you for clarifying the distinction between “to share” and “a share”.

After reviewing how these translations are used in the UI, we made two adjustments:

• We kept “Shares” untranslated because this key names the share repository in the file tree, the synchronization wizard, and notification titles. Translating it as “Gedeeld” would mean “Shared” and would duplicate the existing translation of the separate Shared key. This also follows the chosen convention of keeping the noun “share” untranslated.
• We changed “Delen is uitgeschakeld” to “De share is uitgeschakeld”. This warning refers to a specific disabled share, similarly to “Space is disabled”. The previous wording suggested that the sharing functionality itself was disabled.

We kept the other improvements from the PR, including “Share” → “Delen” for the action and the updated wording for “Gedeeld met anderen”, “Gedeeld met mij”, and “Gedeeld via links”.