Closing a presentation only offered Cancel or "Save and close", so
unsaved edits could only be dropped by force-quitting. That left an
autosave recovery snapshot behind, creating version ambiguity between
the saved file on disk and the restored unsaved copy on next launch.
Add a third "Niet opslaan" (discard) choice to the close/quit dialog.
Discarding closes without saving; closeTab() and _destroy() already
clear the recovery files, so no shadow version remains and there is a
single unambiguous version afterwards.
Register the "Niet opslaan" string for all 8 supported languages.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
483264b652