Refine Dutch localization strings in nl.xml

[MrNick4B]

Updated Dutch translations for spelling and consistency improvements (nl.xml)

Proposed Changes

1. String 2 is untranslated. The message body still reads {0} to {1}. Translated to
{0} naar {1}.

2. String 4 uses the wrong tense. "could not be updated" is past tense, but "kan niet
worden geüpdatet" means "cannot be updated". It says the update is impossible rather than
that it failed. Changed to "kon niet worden bijgewerkt".

3. Space before the exclamation mark (strings 2 and 5). That spacing is a French
typographic convention; in Dutch the mark attaches directly to the preceding word. Removed the spaces.

4. "software updates" is written as two words. English compounds are not split in Dutch.
Corrected to "software-updates" (the form "softwareupdates" is also valid).

5. "manuele" is Belgian Dutch. For a Netherlands audience "handmatige" is the standard
term. If this file is specifically localised for Flanders, "manuele" can stay, but it should
then be applied consistently.

6. "bijgewerkt" instead of "geüpdatet". Both are understood, but "bijwerken" is the term
Microsoft uses in the Dutch Windows interface, so it will feel familiar to users and matches
the surrounding OS. Applied throughout. For the same reason string 5 now uses "logs"
(matching the plural in the source) while string 11 keeps "logbestand", since the English
there is singular and the action opens one specific file.

7. "Zie changelog" → "Bekijk changelog". "Zie" is the wording of a cross-reference in
written text ("see appendix B"); for something the user clicks, "Bekijk" is the natural verb.
This keeps it consistent with "Open logbestand", which is unchanged.

Related Issues

Closes #1186