Issues in arabic language?

When export xls file Arabic letters shown as ???,
only in this file “tablename_export_ctrl.php”
and the exported files refuse open.



After that I change the default language to English it works very good
But in chart is different


Before I send this error message I made a new project, So the same result.
Then this error occured after update, So if i uninstall SC it will solve this issue?