I receive the following error when trying to download the base language file through the Xcode plugin:
No localized files found for language: Base
Please note that `Base.lproj` should only contain IB files e.g. `.storyboard` and `.xib`. The `Localizable.strings` for English should be placed under `en.lproj`. `Base` is not a supported locale by iOS and our plugin.
Here is more information from the Apple Developer site.