Translation keys may be displayed instead of translations for the rest of the users (except last author)

Steps to reproduce:
1. Create an app as Admin; add several fields in the class; and add them to the livetable, see adminLivetable.png
2. Log-in with another normal user (in my case evalica), edit the application and just resave, see evalicaLivetable.png
3. Log-out (as guest) or just re-log-in with Admin. The livetable header shows translations keys instead of translations, see guestLivetable.png