Change language of the interface

I am using Etcher on Gnu Linux.

When I launch, the AppImage, Etcher works normally but its interface is in English. I would like ti have in French.

In the log, I see “Language changed to: en”.

I have tried to launch with “–lang=fr” but without success. I have checked that I have the environnment variable well set to “fr”.

Is there a way to customize the language of the interface ?