[not tested, notes jotted down while helping fellow code sprinter test the translation of Forum titles]

Enable locale module

[new] In Drupal 7, the fastest way to add a language is to place the package of po files in the Drupal root directory and then add the language. It finds the po files automatically. (We do not go to import a language as in Drupal 6. Now we only use import for individual po files we add later.)