Update localisations

[Eitot]

This adds missing localisable strings to the base localisation and updates the Dutch and German localisations.

Fixes # (issue)

Misc Checklist

• My change requires a documentation update on Sparkle's website repository
• My change requires changes to generate_appcast, generate_keys, or sign_update

Testing

I tested and verified my change by using one or multiple of these methods:

• Sparkle Test App
• Unit Tests
• My own app
• Other (please specify)

macOS version tested: [place version here]

[zorgiepoo]

Any reason "Application Name" and "Application Version" use shortened names like this? This seems to be English.

[zorgiepoo]

I guess same is done with OS-version so I assume it's intentional.

[Eitot]

Apple uses the short form app instead of applicatie in Dutch, across the system. The Applications directory is called Apps too, so I chose this for consistency.

Apple uses the short form in German as well, but not as consistently as in Dutch. I chose this here mainly to keep the field short, but it may be reconsidered depending on how it looks (Anwendungsname or Name der Anwendung would be the substitute), as the field for CPU speed is long too.

[zorgiepoo]

Is it intentional the 'e' is left out?

[zorgiepoo]

Okay, same is done with CPU Subtype, so I assume it is.

[Eitot]

Yes, in German the word for type has no 'e' at the end.

[zorgiepoo]

Thanks.