question mark when exporting arabic lang

[Mark Lin]

Hello,
when exporting arabic language file i'm getting -
  <string id="1" name="conference">
    <value>?????</value>
  </string>
  <string id="2" name="meeting">
    <value>?????</value>
  </string>
  <string id="3" name="classroom">
    <value>???????</value>
  </string>
  <string id="4" name="settings">
    <value>??????</value>
  </string>
  <string id="5" name="benutzer">
    <value>??????</value>
  </string>
  <string id="6" name="admin">
    <value>????</value>
  </string>
  <string id="7" name="stop">
    <value>????</value>

What can cause this behave?

Thank you