Terms Of Service: Problem with localization


I've just updated the TOS plugin.

Before this update, the plugin was into the mu-plugins/ folder. I just had to put a tos-fr_FR.mo file into the same folder (at the same level) and it worked. But now the plugin is in the plugins/ folder. I tried to put the tos-fr_FR.mo file into the signup-tos/languages/ folder but it didn't work. I then tried to put it at the same level (into the signup-tos/ folder) but it didn't help.

What am I doing wrong? Where should I put this mo file?