It looks like something slipped in the definition of the Russian workbooks.
Unzip attachment. In TB - Settings choose the button in the bottom right hand corner (run special command, the caption is missing).
It will ask you if source is reliable. Click yes and navigate to the txt file you unzipped. It will tell you everything went OK if you saw no errors.
Import mwb again and it will show the lessons now.
For accessing the database my personal preference is http://sqlitebrowser.org/
For editing templates I now use https://code.visualstudio.com/