In the upper-right corner of the screen, click on the icon of an “A” merging into a Japanese character. That will open the full catalogue of available translations. Click on any given language to access everything available in that language.
Also, if you open any page with content on the website for which translated versions are available, a similar icon will appear in the upper right corner that looks like an “A” circling into a Japanese character. Click that icon to open a drop-down menu of all the available translations for that book or transcript. (For example: The Ra Contact.)