Mac OS X provides a range of languages, so you could set your own language easily. Process to change Mac OS language is simple, just follow the steps and see the given screenshot to set your desired language on Mac.
Click Apple home button and then click System Preferences
Click on International icon
Here you can see the Languages which are already selected, so click on Edit List button if you want to chose any other language
It opens a list of all provided languages of system, select the check boxes of languages you want to add and press OK button
Now click on Languages button, it’ll show all the languages which are added now
Here you can change the order of languages according to your preference just by drag and drop. As we put English on the top
Close the screen, and restart your system to make the changes effective