I didn't know what I did wrong:
1. I import a language. Then I open a new tab (call this tab X) with the homepage with two languages.
2. After that I deleted the language I just imported.
3. I import it again. While it was still loading, I changed the language onto the one I deleted on tab X.
4. The process stopped (I saw deffered or something at the address bar) and I got a blank page after that. I can't access admin.php. It just a blank page without any errors.
Anyone know what's happening and how to revert it back?