Small fix for German translation

[konstantintutsch]

• Increase consistency of German translation on Events screen

Overlooked this in my last PR. :)

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[Brawl345]

Just wanted to open a new PR with it but then I saw yours: Can you also please change all singular "Ereigniss" to "Ereignis"?

https://github.com/konstantintutsch/umami/blob/dev/src/lang/de-DE.json#L70-L71

https://github.com/konstantintutsch/umami/blob/dev/src/lang/de-DE.json#L274

[konstantintutsch]

@Brawl345 👌