Maybe, there are some fonts that it show wrong in your language, ex: some charaters display as ‘?’.
Example, your menu display wrong, you should go to phpmyadmin, open table menu and choose structure tab, and edit ‘title’ field. Please choose Collation is ‘utf8_general_ci’. With other tables, it’s same. 

If you want change to ‘utf8_general_ci’ on whole your site, you can export sql file, replace all and import that file again.