add some missing english translations

[nr-b]

Description

Add two missing english translations and remove an unused german translation.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Built the UI, saw the correct labels on the pipeline new form.

Test Configuration:

• Operator Version:
• Kubernetes Version:
• Kubero CLI Version (if applicable):

Checklist:

• I removed unnecessary debug logs
• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I documented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings