Update de.lua missing keys

[bluecraank]

Describe Pull request First, make sure you've read and are following the contribution guidelines and style guide and your code reflects that. Write up a clear and concise description of what your pull request adds or fixes and if it's an added feature explain why you think it should be included in the core.

Some corrections for German :)

If your PR is to fix an issue mention that issue here

Questions (please complete the following information):

• Have you personally loaded this code into an updated qbcore project and checked all it's functionality? [yes/no] (Be honest) y
• Does your code fit the style guidelines? [yes/no] y
• Does your PR fit the contribution guidelines? [yes/no] y

[ChristianBDev]

@bluecraank Please update the code to the requested changes so we can continue