[missing translation: de/poweredBy] if Powered by left empty

Problem/Motivation

If the Klaro "Powered by" is left empty (as discussed in 📌 "powered by klaro" info needed? Active a translation placeholder is shown:

Instead, nothing should be shown. Maybe we need to pass an empty string or blank?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes