Ensure that the formatters in PlayerHelper always use the app language

[litetex]

What is it?

• Bugfix (user facing)
• Feature (user facing)
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

• Currently the formatters of PlayerHelper do not respect the app language as outlined in Speed/Tempo use system language for formatting and not app language #12441 (comment)

Before/After Screenshots/Screen Record

Language set to Deutsch/German on Android 10 (Pixel 5 emulator)

• Before:
  
• After:
  

Fixes the following issue(s)

• Fixes Speed/Tempo use system language for formatting and not app language #12441

Relies on the following changes

• ⚠️ Should be finalized after Enable per-app language preferences for Android < 13 #12444 is done

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. You can find more info and a video demonstration on this wiki page.

Due diligence

• I read the contribution guidelines.

[litetex]

This requires some reworking as #12444 no longer requires an app restart and context is also no longer required to get the language.