Add "an" to german language

[Y0ngg4n]

Description

This adds the word "an" to german language.

Type of PR

If your PR fits more than one category, there is a high chance you should submit more than one PR. Please consider this carefully before opening the PR. Either delete those that do not apply, or add an x between the square brackets like so: - [x]

• [ ] Bugfix
• [ ] Feature implementation
• [x] Refactor of code (without functional changes)
• [ ] Documentation improvements
• [ ] Test improvements