User blog comment:DaNASCAT/Technical Update: March 7, 2016/@comment-24757753-20160308115656/@comment-1757994-20160308182918

Hitting the EDIT button for me brings up a login dialog in Spanish, even if I explicitly add uselang=en to view the page, although maybe that's a caching thing.

EDIT: The issue appears to be resolved for me now (21:20 UTC, 8 March 2016‎).