Q: My Ipad language got changed from english to japaneese, how can I change it back?

On mine, English is on top. Try that. Or, honestly, I'd randomly guess because most foreign languages beyond Russian and the oriental languages usually have 'english' close enough to guess.

Settings, general which you should be able to figure out by the icons. once you get in general, scroll to the bottom. You will see a single option, then a set of 2, then a set of 3. the 'international' which is where you choose languages is the bottom of the set of 3.

Along with Skydiver's directions see if these screenshots help. Notice if you have IOS 8  International has been charged to LAnguage and Region.

Thanks for that.

You're welcome.  It's a slow day and and couldn't resist the using my Skitch app to annotate some photos. i should have added the Google translation for English.    英語

Tap Settings > General > Language & Region > iPad Language > select English.

Glad you got it to work.

You're welcome.