So, at least in the web version (don't know if this is an issue in the app as well) there is a pretty annoying bug.
When you switch between the languages, I would expect to the names for my team members to change as well.
Instead, if you, for example, have a character in English and switch to Japanese, all characters in your team stay the same, only when you add a new one you can have them in the now selected language.