Currently the user is only able to add one language at a time using the 'Add language' menu in the 'Wikipedia Languages' screen. So, a user who wished to add multiple languages would have to add it one by one.

It would be nice if they were allowed to add all languages they like in one go. This would especially be helpful for users accessing the feature for the first time (including those who existing users who re-install the app). They could all the languages they like in one go rather having to add them one by one.