Can't use chinese name? - my little forum

Thanks for your forum. I like this forum.

But, when i test the forum, i can't use chinese name. When i use the word "世界语" as the Name, I can't post my message.you said:

•The user name contains invalid characters

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New release (2.3) - Alex, 2011-09-03, 07:50
- New release (2.3) - Micha, 2011-09-03, 09:40
  - New release (2.3) - Alex, 2011-09-04, 13:47
    - New release (2.3) - Micha, 2011-09-04, 13:57
  - I did not read the message. Now I have a white page. - kt007, 2011-10-23, 09:22
    - I did not read the message. Now I have a white page. - Micha, 2011-10-23, 09:28
      - I did not read the message. Now I have a white page. - kt007, 2011-10-23, 09:30
        
        I did not read the message. Now I have a white page. - Micha, 2011-10-23, 09:35
- Smarty 3 and {php} - edkgb, 2011-09-04, 11:15
  - Smarty 3 and {php} - Micha, 2011-09-04, 11:52
    - Smarty 3 and {php} - edkgb, 2011-09-04, 12:29
  - Smarty 3 and {php} - Alex, 2011-09-04, 12:25
    - Smarty 3 and {php} - edkgb, 2011-09-04, 12:44
  - Smarty 3 and {php} - Alex, 2011-09-04, 12:47
    - Smarty 3 and {php} - edkgb, 2011-09-04, 13:26
      - Smarty 3 and {php} - Peter, 2011-09-12, 06:49
        
        Smarty 3 and {php} - edkgb, 2011-09-12, 08:35
        
        Smarty 3 and {php} - Peter, 2011-09-13, 13:50
- New release (2.3) - koko, 2011-09-17, 20:17
- Can't use chinese name? - Esperanto, 2011-10-26, 05:55
- New release (2.3) buttons "OK-Submit" missing - Romina, 2011-10-26, 16:24
- Russian.lang updated for New release (2.3) - Urfin, 2011-11-23, 08:47
  - translated description of "akismet_registered" option - Urfin, 2011-11-24, 09:17
- Installing on Windows 7 Pro - Kima, 2011-12-01, 22:32
  - Installing on Windows 7 Pro - Forgot to say - Kima, 2011-12-01, 22:41