Updated SQL scripts for langStats
Translations updated via update-translations.sh.
#115 Cleaned up and added comments for the script create_fill_langStats.sql
Added back cache folders

The tmp/cache folders was removed at some point. I'm adding the folders
back. Not having these folders will generate an error on dev versions
that use the "File" cache engine:

Warning (512): Cache not configured properly. Please check
Cache::config(); in APP/config/core.php [CORE/cake/libs/configure.php,
line 646]