tomchristie/django-rest-framework — pull request #1863 by jbinney (2014-09-11 03:34:09+00:00)
Title: Fix grammar in login error message

"Login" is a noun or adjective; "log in" is a verb [[1]](http://grammarist.com/spelling/log-in-login/). Here, we're using the infinitive form of the verb, so it should be "log in."