Calculated Questions Display Broken in Language Deutsch (de)

• Use Boost Theme
• Set Language to Deutsch (de), which is the first language in the list on my installation.
• Create a Question of Type "Calculated" ("Berechnet")
• Save the Question to be switched to continued editing

Texts are all bold, also in the navigation (s. Capture.png)

There is a linebreak after each character (s. Capture.png)

Switching to another Language -> Everything is OK (s. Capture2.png)