Altering the language of Facebook is also beneficial if you wish to utilize it in your mother-tongue. Its easy to alter the Facebook language for your current Facebook session. Simply go to the bottom of your page and click on the existing active language.
Facebook In English
This will open a window with all the available languages for Facebook. Simply choose the one you want and Facebook will be translated instantly.
The selected language will be readily available just for your existing session of Facebook. That is, when you log out, the language will alter back to default.
Note: If you are currently logged into Facebook, it will be extremely hard to scroll down to the end of page as the timeline design of Facebook will keep including stories dynamically, moving the bottom continuously. So if you can't click on the language link at the bottom, then log out of Facebook and after that click it and then log in once again.
If you desire to permanently alter the language of Facebook, go to Facebook language settings page and choose the language from the fall list of languages.
Click 'Save' after selection and the language of Facebook will alter permanently for you. You can roll back the language by going to this page and changing it again.
Update: Facebook In English, If you wish to translate Facebook into a language which is not available in Facebook's list of languages, then you may have to try Google translate or Google equate web browser add-ons to translate it.