1.3.3dev: Replace `ur` literals
1.3.3dev: Replace `ur` literals

The prefix is not supported in Python3.

Refs #12130.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@16622 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac