Simplest way for things as music on/off is to have a global value setting.
If music off button is clicked -> set global value a to 1
in the begining of your game frame have a group that checks for option settings:
If global value a is 1 -> mute sound (or whatever your action is).
For language.. It probably depends on what parts of the game you're translating. If it's menu buttons that are objects you would either have different animations or objects for each language. Then do a similar check as music and then change animation/show the right language object.