Added adjustments to view only one FAQ topic.

 * The faq topic is chosen by the viewer's language.
 * The viewer's language must be in the list of supported languages,
   and it defaults to the application default if the faq is not present
   in the viewer's language.
 * Added a management command to populate the faq topics based on the
   LANGUAGES setting.
Fixed the name of the database in the settings.
Merge remote-tracking branch 'origin/staging' into i18n-faq
Do not localize the #s for coordinates.
Restored TopicWrapper. More comments to management command.
Merge pull request #124 from dzwarg/i18n-faq

Add i18n to faq app.