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When working on multilanguage sites, a feature that many times I missed is a direct way to change the language when you're on the admin,
With standard Django the only way that exists (as far as I know), is leaving the admin, going to the website, change the language there, and come back to the admin. Not very fast.
Today, I've created a snippet that creates a drop down menu on the admin bar (just in the main page) to change the language.
Hope it helps.