Implemented domains in translations. Fix #116 and #177
Added heaer and 2 constants
Using now THELIA_CACHE_DIR
Loading of modules i18n files.
Translation of modules templates files
Improved the regex for searching i18n strings in templates
Fixed some translations
Removed call to Tlog (prevent installation !)
No namespace in Tlog call
Internationalization of email templates
Added default domain
Merge pull request #323 from roadster31/modules-intl

Modules intl