Tooltip Refinements

[JonasGilg]

Description

Some small adjustments to tooltips.

Checklist

I, the author of this PR checked the following requirements for good software quality:

• [x] The code is properly formatted (I ran the formatter)
• [x] The code is written with our software quality standards (I ran the linter)
• [x] The code is written using our code style
• [x] Extensive in source documentation has been added
• [ ] Unit and/or integration tests have been added
• [x] All texts have been internationalized with at least the following languages:
  • [x] English
  • [x] German
• [x] I tried addressing all new accessibility problems displayed in the console and documented if they can't be fixed
• [ ] I attached performance measurements to prevent performance degradation
• [x] I added the changes to the next release section of the changelog

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[github-actions[bot]]

Unit Test Results

  1 files  ±0  14 suites  ±0   25s :stopwatch: -1s 32 tests ±0  32 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  33 runs  ±0  33 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 4d75e046. ± Comparison against base commit 420411c0.

[JonasGilg]

Firefox has a weird bug with the tooltips on the button bar (play etc.). on hovering the grey background becomes transparent and the white text isn't legible anymore. Not sure if there's much we can do about it, do we need an issue to keep trck of it?

I can not reproduce this issue. Can you send a screenshot?