Second, use ezlupdate utility to update your translation.ts file. The binary of this utility used to be part of ezpublish but not anymore. However, you can built it. The source can be found at
/support/lupdate-ezpublish3
Your text translation is disabled.
TextTranslation=disabled
Check that you have fra-FR.ini in your locale directory.
Hi Stephen, I don't know about a way to change the default fallback language, but if it where possible it would probably make a lot of warnings appear since there are no eng-gb translation.
I don't know of any simple way to transform content from one language to another either.
As for your German site, are regular ez publish translations working or are everything untranslated?