This prints two lists of languages, the fully supported ones and the locally supported ones:
the languages in the category "fully" will return translated names and other info for all countries.
the languages in the category "partially" will return translated names and other info only for the country they represent.
languages_supported()A list of fully and partially supported languages.
For example, choosing "vi" (for Vietnamese) will translate "Vietnam" in the dataset but other country names won't be translated and will be empty.