fixed translation errors

[leonv5]

Some translatiosn from english to german were not correct. I fixed the grammar errors and replaced some words with more suitable.

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• I have read the contributing guidelines.
• My code is of good quality and follows the coding standards of the project.
• I have tested my changes, and they work as expected.

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[leonv5]

I have read the CLA Document and I hereby sign the CLA

[daveearley]

Thank you for contributing this! Much appreciated