UI not translated

[anto1ne]

Hi,

First of all, thank you, your application is just great.

I write this issue because Debreate is not in French on my computer. I saw in the about dialog that french translation was avalaible so I guess that Debreate did not see my langage is french.

OS : xubuntu 18.04.3
Debreate : 0.7.13 (from ppa stable)