How to change the language on my Snapchat?

So I pranked my friend by changing her phone (iPhone) language to Arabic (haha not very funny I know), however when I changed the phone's language back, Snapchat decided to stay in Arabic. I've tried to restart the phone, restart Snapchat, uninstall and reinstall it back but it won't change! Is there som kind of setting that I have missed?

First quit Snapchat from the multitasking menu (double-click the home button to get to this), then uninstall Snapchat, then sign out of your Apple account in the App Store (option to sign out is at the bottom of the App Store, scroll down on the main page).

Once you've done that, do a Hard Restart of your iPhone by holding down both the Power and Home buttons at the same time until the screen goes black and the Apple logo appears. Don't worry, no data will be deleted from your phone.

Once your iPhone has restarted, simply sign back into your Apple account using your Apple ID, and reinstall Snapchat. It should be back in English.

Hope this helps!