I therefore wish to remove a specific language, but I wonder if there are any basic rules or limitations about removing a language from an app. For example, am I required announcing the removal in some place (e.g. App Store or my website), for a predefined time period (e.g. one year ahead of removal)
I can easily envision a case where a user who just purchased the app with support for her native language, have the app suddenly appear in English on the next update from the App Store. And that after paying nicely for the app and putting the efforts to build its database. That would obviously frustrate the user.
Any thoughts about how to deal with this?