Redefine module's connection with its localization file.
    
    - Previously, modules read localization file from its own directory
      structure (e.g., Scripts/Modules/Hello/Locales/). This update
      makes all modules to use one unique localization files, the
      Scripts/Locales/${LANG}/tcar.po file.
    
    - Previously, the TEXTDOMAINDIR variable was not printed in debugging
      output. Now it is.