add language to existing installation

Multilingual support is provided by the Locale core module.

See Install Drupal in another language for adding a language when installing Drupal.

To add languages to your existing Drupal installation:

Drupal 6 and 7

Add languages

• Enable the Locale (core) module
• Go to the language configuration page:
  • Drupal 6: Administer > Site Configuration > Languages
    (admin/settings/language)
  • Drupal 7: Configuration > Regional and language > Languages
    (admin/config/regional/language)

  On that page:

  • Add the languages you want
  • Set a default language. Never change the default language, otherwise things will break!
• Continue with the Automatic or Manual method below to update your strings

Automatic method

• Install the Localization update (l10n_update) module (see instructions)
• Update the translations for your languages:
  • Drupal 6: Administer > Site Building > Translate Interface > Update
    (admin/build/translate/update)