Add UM/Gradecraft toggle to failed-login page.
Add UM/Gradecraft toggle to failed-login page.

zqian/gradecraft-development,mkoon/gradecraft-development,peterkshultz/gradecraft-development,peterkshultz/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,peterkshultz/gradecraft-development,zqian/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,mkoon/gradecraft-development,mkoon/gradecraft-development,zqian/gradecraft-development