0.12.1dev: LANG can be used to enforce language selection for TracAdmin.
0.12.1dev: LANG can be used to enforce language selection for TracAdmin.

This reworks slightly r10053, so that LANG can take precedence over the environmen's default language, itself taking precedence over the Babel selected locale.

Closes #8117 again.


git-svn-id: 7bda06b145a4a8e9a7f4be07d7c3eb82923a12d6@10060 af82e41b-90c4-0310-8c96-b1721e28e2e2

netjunki/trac-Pygit2,jun66j5/trac-ja,walty8/trac,jun66j5/trac-ja,jun66j5/trac-ja,netjunki/trac-Pygit2,walty8/trac,netjunki/trac-Pygit2,walty8/trac,walty8/trac,jun66j5/trac-ja