added German TimeOnlyToClockNotation

[SpocWeb]

Here is a checklist you should tick through before submitting a pull request:

• [x] Implementation is clean
• [x] Code adheres to the existing coding standards; e.g. no curlies for one-line blocks, no redundant empty lines between methods or code blocks, spaces rather than tabs, etc.
• [x] No Code Analysis warnings
• [x] There is proper unit test coverage
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• [x] There are very few or no comments (because comments shouldn't be needed if you write clean code)
• [x] Xml documentation is added/updated for the addition/change
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• [x] Link to the issue(s) you're fixing from your PR description. Use fixes #<the issue number>
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[SpocWeb]

@hangy you can add a culture like "de-DE-BY" with "dreiviertel zwölf" if you like 😜

[SimonCropp]

@SpocWeb can you rebase

[SpocWeb]

@SimonCropp sure, will try and also add some explanation to the contended Method(s) over the weekend, thanks for considering this.

[SpocWeb]

Hi, I don't know why the CI Builds fail. I am not allowed to look at the errors and locally it builds for me in all Configurations. Please share the Build Error Details with me.