This has been discussed on the forum several times. Do a search using terms like keyboard, french, green, blue etc. Several solutions have been offered. See if anything turns up for your particular model and/or keyboard.
Acer is proud to announce the promotion of Philetus to the ACE team. Philetus has been a member since March 2013 and has shown the skills and patience required to be a member of this exclusive, invite only team of experts. Congratulations Philetus!