This topic is: resolved
First: thank you for your work.
I need to translate the theme in the English language.
I found in a directory the file default.po (/sitesao-core/languages/default.po)
and I translate (in part with poEdit). Then I sauvegader this file naming en_US. A fr_FR.mo was created and updated.
However the template seems not to use it.
So my question: is this the right file to be translated, there there a code changed somewhere?