Feature/changelog viewer

[JonasGilg]

Description

This adds a changelog viewer to the burger menu.

Related Issues

Closes #200

Design Decisions

There are now two changelog files, one in English and one in German. Depending on the user lang the correct one will be rendered using react-markdown.

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

I, the reviewer checked the following things:

• [x] I ran the software once and tried all new and related functionality to this PR
• [x] I looked at all new and changed lines of code and commented on possible problems
• [x] I read the added documentation and checked if it is understandable and clear
• [ ] I checked the added tests for completeness
• [x] I checked the internationalized strings for spelling errors
• [x] I checked the performance metrics for problems or unexplained degradation
• [x] I checked that the changes are noted in the changelog

[github-actions[bot]]

Unit Test Results

  1 files  ±0  13 suites  ±0   26s :stopwatch: -3s 34 tests ±0  34 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  35 runs  ±0  35 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit f4f226d4. ± Comparison against base commit e5a13a02.

:recycle: This comment has been updated with latest results.

[coveralls]

Pull Request Test Coverage Report for Build 4697461496

• 9 of 21 (42.86%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 17.769%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
frontend/src/components/TopBar/ApplicationMenu.tsx	3	6	50.0%
frontend/src/components/TopBar/PopUps/ChangelogDialog.tsx	6	15	40.0%
<!--	Total:	9	21	42.86%	-->

Totals
Change from base Build 4509696578:	0.3%
Covered Lines:	273
Relevant Lines:	1201

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💛 - Coveralls