Addinf filter for user from courses
Adding ransack for filter
Change view for filter
Adding interpolation to view
Tests refactoring
Adding right interpolation to locales
Tests refactoring
Merge branch 'feature/list_of_users_from_course_69' into develop

Conflicts:
	app/views/web/admin/courses/index.html.haml
Merge branch 'feature/testsfixing' into develop