We’ve got a few users adding new languages with only a few strings translated, and this is messy for us to manage. These languages are not usable because so few strings are translated. Some of them are regional variants that add no value (e.g. adding ru_RU when ru is already present).
We would like to require at least the Manager permission to be able to add a brand new language.
This way, we can allow certain specific contributors, but not all, to add new languages.