There are three choices of language. At least on mobile it would be nice if I could save a little space in the footer by omitting the currently active language. This seems risky though as it means the two choices would shift. On the other hand, a user isn't likely to change the language more than once on a page.
EDIT: The language selector will be available on all pages. This is not what the question is about. The question is whether or not the currently selected language should be shown or only the language that the user can switch to. When the switch happens one of the choices will be swapped with the previously selected language. For example if the currently selected language is German, the language selector would show:
FR | IT If the user selects
FR it will be replaced by
DE and the page will be displayed in French.