Default language should be based on user babel box

Open, LowPublic

Actions

@Anthere Please can we have a detailed description of this task?

Indeed. I quickly entered that as it came from the suggestion of a third party. But it is not clear I see that now.
I think the concept is "when someone launches the tool, by default, the interface is in English. Then after the person logs in, the language of the interface should be based on the language preference used on Wikimedia Commons". Of course, by default, when no translation for that language is available on ISA, it will stay in English. But "user babel box" is "language preference on commons"

Thank you for tagging this task with good first task for Wikimedia newcomers!

Newcomers often may not be aware of things that may seem obvious to seasoned contributors, so please take a moment to reflect on how this task might look to somebody who has never contributed to Wikimedia projects.

A good first task is a self-contained, non-controversial task with a clear approach. It should be well-described with pointers to help a completely new contributor, for example it should clearly point to the codebase URL and provide clear steps to help a contributor get set up for success. We've included some guidelines at https://phabricator.wikimedia.org/tag/good_first_task/ !

Thank you for helping us drive new contributions to our projects <3