>> So, I'm still doing something wrong, because changing the translation 
>> of "figure" in "mult-def.lua" (in the part "variables"), only affect :
>> 1- command "\startfigure    \stopfigure"
>> 2- "figure" in "\setuppageinjection" > alternative = figure buffer...
> You have to provide your modified mult-def.lua file, otherwise there is 
> no way to check what's wrong.

Patch file : mult-def.lua.test1_figure.diff

context --make fr
context --interface=fr --global --result=setup-fr x-setups-overview.mkiv

Then the pdf file shows
- \demarrefigurefr as expected (p62)
but
- \placefigure         instead of \placefigurefr (p190)
- \demarreplacefigure  instead of \demarreplacefigurefr (p72)


>> the translation of the variable "itemize" has no impact on the 
>> setup-fr.pdf file produced
>> But, I just found that if I actually use the translated commands in a 
>> test.tex file, it just works.
> Same as above, provide your translations.

Patch file : mult-def.lua.test2_itemize.diff
Input file : test2_itemize.tex

context --make fr
context --interface=fr --global --result=setup-fr x-setups-overview.mkiv
context test2_itemize.tex

setup-fr.pdf shows "\debutitemize  ... \finitemize" page 41
instead of         "\debutlister   ... \finlister"

but the input file, with "\debutlister   ... \finlister", works great.

> There shouldn't be a problem with fonts because they use \s!file or 
> \s!name which aren't translated (unless you made the mistake and have 
> \c!file in your typescripts). It's possible there is a bug somewhere but 
> you have to provide a minimal example.

Understood, I am going to check.