Description of problem:
Steps to Reproduce:
$ echo $LANG
pt_BR.utf8
$ dnf makecache timer 
error about 'ascii' codec
$env LANG=C dnf makecache timer 
no error: everything is ok. However, I have the package yum-plugin-local installed and dnf disable the _local repository.

Additional info:
Message about _local repository:
"""
Problem with repo '_local': Cannot prepare internal mirrorlist: realpath(file:/var/lib/yum/plugins/local) error: No such file or directory, disabling.
"""
Maybe the translated message cause the bug...

Version-Release number of selected component:
dnf-0.4.9-1.fc20

Additional info:
reporter:       libreport-2.1.10
cmdline:        /usr/bin/python /usr/bin/dnf -v makecache timer
executable:     /usr/bin/dnf
kernel:         3.12.5-302.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
base.py:125:_add_repo_to_sack:UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 129: ordinal not in range(128)

Traceback (most recent call last):
  File "/usr/bin/dnf", line 35, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 260, in user_main
    errcode = main(args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 63, in main
    return _main(base, args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 122, in _main
    result, resultmsgs = cli.run()
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 1471, in run
    return self.command.doCommand(self.base.basecmd, self.base.extcmds)
  File "/usr/lib/python2.7/site-packages/dnf/cli/commands.py", line 953, in doCommand
    self.base.fill_sack() # performs the md sync
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 214, in fill_sack
    self._add_repo_to_sack(r.id)
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 125, in _add_repo_to_sack
    msg = _("%s, disabling.") % str(e)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 129: ordinal not in range(128)

Local variables in innermost frame:
repo: <Repo _local>
hrepo: <_hawkey.Repo object at 0x7f52bfe774f8>
self: <dnf.cli.cli.BaseCli object at 0x1942410>
e: RepoError()
name: '_local'