7519: GRAMPs unable to handle ... Path with accented characters
Much worse, actually. Gramps wasn't able to handle any non-ascii
characters in any preference setting from Python2.
repr() in Py2 effectively runs "encode(val, ascii, backslashreplace)"
on its argument, and there's no way to reconstruct the string.
(cherry picked from commit 8cbb3ef014d6dd0d91c2eafba298bdc41ead750b)