Implement Dutch language and issue #2579 #5957

Job	Run time
compile	1m 20s
check-translations	47s
knip	51s
test-extension (ubuntu-latest)	1m 47s
test-extension (windows-latest)	3m 53s
check-openrouter-api-key	1s
test-webview (ubuntu-latest)	1m 25s
test-webview (windows-latest)	3m 5s
integration-test	0s
unit-test	3s
	13m 12s

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