Navigate to admin -> langauge -> language packs Install some langpacks Back on the langpacks page... Do not select any langpacks Press the Uninstall button Confirm you are shown a notice that you must selet something Select just the English langpack Press the Uninstall button Confirm that you are shown a notice that you cannot uninstall English Select the English langpack and an earlier langpack Press the Uninstall button Confirm that you are shown a notice that you cannot uninstall English Select the English langpack and a later langpack Press the Uninstall button Confirm that you are shown a notice that you cannot uninstall English Select a whole set of langpacks Press the Uninstall button Confirm that you are shown a notice that you cannot uninstall English Select multiple langpacks which are not english Press the Uninstall button Confirm you are shown the confirmation Press the "Cancel" button Confirm nothing changed Press the Uninstall button again Confirm you are shown the confirmation again Press the "Yes" button Confirm that the page refreshed and that the languages were removed