I have installed trac on my server running Ubuntu 12.04. The problem is that the users cannot change the language in their preferences. Instead, the following message is displayed:
Translations are currently unavailable. Trac has been localized to more than a dozen of languages but in order to be able to use them, the Babel package needs to be present when installing Trac. See TracInstall for details.
The installation has been done using the repositories of Ubuntu, but I could not find any package related to trac and babel, nor trac and anything related to internationalization.
How can I install the translations for trac?