[TASK] Add german language for the front store

[awestbunk]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

The front store has no german translation.

Issue Number: N/A

What is the new behavior?

German translation for the front store

Does this PR introduce a breaking change?

• Yes
• No

Other information