In enather cases i can want to make one glossary with for useful terms, some of which is in english, and another is in russian. I need long index in alfabet line with both alfabets.
May be will be best to make index line not by primary alfabet, but by using sorted set of really used in terms first letters?
if you change the language for your course in the course settings at the bottom of the settings site to english, you use the english menus and the englisch alphabet.
The alphabet is defined in the moodle.php of the lang/ru/moodle.php for your complete moodle installation.