Default Simple way to change the system language

Your phone needs to be rooted for app to work flawlessly
Might NOT work on 4.1.2 roms 90% of the time, so far only 4.3 showed results
This should work for almost any rooted device, no system restart is required and this is very simple
follow the steps and that's it

Install this app

Then check if the language you want is in the main page and if yes select the language and country if it's present in the main screen


Then click "custom locale" (in the top right screen)
it will open a new screen
then select the language you want from the big list and then the country
No need to select varient, just leave it empty as that's fine
Now Click set and your phne system language should be set to the language you selected

the image shows the language i selected "SINHALA" Country "Sri Lanka",
the screenshot is from stock 4.3 INU Note 2 rom
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Current Device- Samsung Galaxy Note 2 (GT-N7100) Stock rom ROOTED
Old device-Motorola Atrix 2 (MB865) ICS supercharged v 7 + Pandroid 3
Old device-Nokia E63
Old device-Motorola V968