refactor: Add TranslationFacility for decoupling from HOVerwaltung

[sgcr]

1. changes proposed in this pull request:

• In the PR [FEATURE]: #2140: Add ArenaInfoPanel #2141 for feature [FEATURE] Arena sizer: Add the general information about the current stadium #2140 (ArenaInfoPanel) were some comments. So I started developing a HumanDuration class that could also produce a human readable string from itself.
  That needed translations, and when I wrote tests, I noticed that I needed an instance of HOVerwaltung, which is a singleton. I got a strange error message that the DB is working and the reason is the singleton.
  Those are the facts.
  The idea is to have a holder of the globally used instance of the translator: TranslationFacility
  The main advantage is that it is possible to change the translator of the application during the tests (e.g., the LANGUAGE_NO_TRANSLATION or LANGUAGE_DEFAULT) without doing anything else by accident.

2. src/main/resources/release_notes.md ...

• has been updated

3. [Optional] suggested person to review this PR @tychobrailleur @wsbrenk

[tychobrailleur]

Thanks! Some minor changes and comments, but definitely a change that improves testability. Also, please keep in mind that one of the project goals is to migrate to Kotlin.

[tychobrailleur]

Thanks for the work!