Something I wanted to do since a long time: move each language to its own directory - backward compatibility included FTW

Signed-off-by: emanuele <emanuele45@gmail.com>
Fixed install and upgrade

Signed-off-by: emanuele <emanuele45@gmail.com>
This should take care of the admin panel and editing of languages

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge pull request #1062 from emanuele45/exp_lang

Something I wanted to do since a long time: move each language to its own dir