Update Decentraleyes locales

I'm hereby submitting various additional locales, as well as changes to existing content.

Detailed overview of changes applied to Decentraleyes:

• Updated license_url, privacy_url, and source_url.
• Replaced "Request Policy" with "Privacy Badger" (inside note).
• Removed outdated English strings from non-English locales.
• Added several new locales (submitted by volunteers).