How to disable Xcode warning "Enable Base Internationalization"?
The warning will go away if you edit your project.pbxproj (inside of your xcodeproj) with an editor and add Base to the knownRegions key.
Not sure if it has any side effects though.
knownRegions = ( en, nl, Base,);
I managed to get rid of the warning by turning off "Missing Localizability" in the build settings.
This prevents the warning from reappearing if you turn off base internationalization.
To remove the initial warning i had to restart xcode with base internationalization turned on. Once the warning is gone you can disable base internationalization again. And be happy because there is one less warning in your project. (or very happy if there are none)
You need to open all XIB or storyboard. Check localization table. If it is a space, you need to choose a localization language.