For example Portuguese is not in the list of users spoken language options:
gwt-cordova/src/main/resources/nl/ru/languageininteraction/language/client/Messages.properties
But is in the list of in game languages:
gwt-cordova/src/main/csv/LanguageData.csv
If a given language is not in the suggestion list, the user can however just type the desired language and it will be accepted.