Follow these steps to translate your Otus account into the language of your choice.
Right-click anywhere on the screen (for a Mac, PC, or Chromebook with a trackpad, click with two fingers. You can also Control + click on a Mac, or Alt-click on a Chromebook)
A popup should appear in the upper-right corner of the screen. Select the ellipsis.
Select Choose Another Language.
Select the language of your choice.