The grammar is bad so it doesn't make much sense. It's literally "write me in french mother". It could mean "write the word for mother in french" or it could be asking: "can you write in french,...
moi (in French) = me (in English) ...or hi in Finnish, toomoi, moale (in Romanian) = soft (in English)
"en français, SVP (standing for s'il vous plait)" means "in French, please".
Do you speak French?
Comment=how dire=to say something en=in francais=french ..comment dire en francais =how to say something in french