If you add setlocale(LC_TIME, get_locale()); in Line 3 of
widgets\mini-calendar\single-event.php and change date( āDā, $postDate ) in Line 31 to strftime(ā%aā,$postDate ) it will display the language correctly (Sorry for doublepost).
If you add in Line 1 of
widgets\mini-calendar\single-event.php and change date( ‘D’, $postDate ) in Line 31 to strftime(“%a”,$postDate ) it will display the language correctly.