Some buttons are not translatable from English to other languages:
File / New From Template... (Cancel)
Bibliography / Insert Bibliography Entry... (Cancel)
Wizards / Quick Beamer Presentation... (Cancel)
Wizards / Quick Tabular (Cancel)
Tools / Clean Auxiliary Files... (Cancel)
Edit / Searching / Count (Yes, No)
Help / Packages Help... (Open, Cancel)
I am not quite sure what you are reffering to.
The menu entry "File / New From Template" is translatable ...
okay, got it.
Qt5 bug, nothing we can do.