The translations are broken up into two separate pieces.
The interface mainly consists of menus and labels.
The interface can now be translated by following these steps:
Content is anything that is a node in Drupal. Nodes include book pages like this page and materials. Nodes are the main content of the site, so these are the most important to translate.
When translating materials, new translated files can be attached to it.
Translating content is easy.