Move Service description text to helper & translate

What does this MR do?

This moves the service description texts out of the model and into a helper.

It also adds translations to this text so it can be translated into different languages.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Closes #219958 (closed)