Add an entry to conf/langs.php:
$LANGS['sl_SI'] = array('name' => _("language|Slovenian"));
Each application has a po/ subdirectory.
[root@blisk po]# make messages
Copy the resulting file messages.po
into a filename with the language code
of your language.
[root@blisk po]# cp messages.po sl_SI.po
Edit this file with an editor
. Be sure
to edit the file in UTF-8 encoding.
After you have finished translating, build the translation.
[root@blisk po]# make install