Fix Dutch spelling mistakes / literal translations

[ChristopheMB]

Some small spelling corrections for the Dutch translation.

• 'Notificaties' is a too literal translation. 'Meldingen' is more common in Dutch.
• Fixed extra 'e' in 'Weer'
• Fixed extra 'u' in 'Uren'

This includes the corrections of #190

Thank you for making this project open source.

[ChristopheMB]

Fixes the mistake in #190 and some others