So I installed Mokee Rom (KitKat)
and as I usually do on new ROM, I edited Settings.apk. I decompiled it with apktool and I added the lacking translated strings in values-fr, so that the app can be entirely translated in french. Then I recompiled it, I took the resources.arsc from the recompiled settings.apk and I copied it on desktop. I then used the file to overwrite the resources.arsc from the original Settings.apk. It did work and I now have a fully translated app. There's only one small bug, when I click on the option to limit sms message under Security section, the Settings app crash. It did not happen before I did my modification. What could cause this?