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.
Please join me in congratulating IronFly who is the first Acer Community Member to achieve the rank of ACE Pathfinder. IronFly has shown a consistent willingness to help others and has worked hard to earn this new Rank. Congrats and Thank You IronFly.