I am building a website in django-cms which will support mainly 2 languages (en, es).
However, "guest" articles will appear at times in many more languages (like 15 or more potentially). I do not want to add all of these separately. I would rather use something like (en, es, "other") as a wildcard to hold all languages other than the 2 main ones.
The reason is to keep the CMS as simple as possible as these entries will be quite rare. Also, I don't know beforehand which languages might be used so I can't add them statically in the settings.py file.
Any ideas on how to achieve this?
No you can't do that & it wouldn't work if you could. Just add the languages when you know what you are going to support.
The purpose of including a language is that you write content in that language for the people who use that particular language. You can't write content in other, so just stick to the languages you'll actually have content written in.