The in other languages box allows editing labels, descriptions and aliases in the languages defined by the user's babel boxes. We should allow editing more languages there. Currently this is solved via the label lister gadget. Ideally we would be able to get rid of it completely and have its functionality built-in.
Conceptually we have several levels of languages to edit:
- the current interface language
- all languages defined in babel boxes
- all languages that the item currently has some label/description/alias for
- all languages Wikidata supports
Initially we will not cater to the last one. We make it possible to get to all languages that have at least one label, description or alias set via a "more" link or button.