The uninstallation of the app is kept as simple as possible. Open in the app the settings you see on the right side:
In the Option overlay you get the Button "cleanup theme"
Then gTranslate removes all settings and locales that gTranslate has set up in its theme:
After the Cleanup prozess you get an Cleanup complete! message:
If you used the inline switcher option or the custom switcher, you have to remove this include and possibly javascripts from your theme. Then you can delete Tantum Translate from your apps.