Ruby 1.9: fix parsing error of pt-BR.yml with psych yaml library (#8847).

It seems that double quote and escape is need for non ASCII and backslash
on ruby 1.9.2p290 (2011-07-09 revision 32553) [i686-linux].

Contributed by Etienne Massip.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6650 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/locales/pt-BR.yml

@@ -990,7 +990,7 @@ pt-BR:
   field_root_directory: Diretório raiz
   field_cvs_module: Módulo
   field_cvsroot: CVSROOT
-  text_mercurial_repository_note: "Repositório local (ex.: /hgrepo, c:\hgrepo)"
+  text_mercurial_repository_note: "Repositório local (ex.: /hgrepo, c:\\hgrepo)"
   text_scm_command: Comando
   text_scm_command_version: Versão
   label_git_report_last_commit: Relatar última alteração para arquivos e diretórios