add comments to languages.py

'''

searx is free software: you can redistribute it and/or modify

it under the terms of the GNU Affero General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

searx is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License

along with searx. If not, see < http://www.gnu.org/licenses/ >.

(C) 2013- by Adam Tauber, <asciimoo@gmail.com>

'''

# list of language codes

language_codes = (

    ("ar_XA", "Arabic", "Arabia"),

    ("bg_BG", "Bulgarian", "Bulgaria"),