The thread mentioned by you is actually about translating stuff in another Software AG product and not about Cumulocity in specific.
The tutorial app (createable via: c8ycli new my-app tutorial as mentioned here: Tutorials - Cumulocity IoT Guides) covers most of the stuff regarding translation, did you already look into it?
thank you very much for your answers, Christians answer actually lead me to the correct solution. No idea why this was not google-able for me; it’s super straight forward.