Page "edit discipline > students".

fix empty fullnames on rating page. fix teacher search on teacher binding page. fix undefined vars in sql

+ Functions create, edit and exists in the discipline model
+ Redirect time switched to 500 ms

If you try to search something not existing in the list of subjects, then you will get an "No matches found" message. Some people don't know english, so i added russian localization. But it should be translated soon.