[Koha] "Refine your search" option problem

Hi all i have noticed in OPAC the "Refine your search" option when i search with Arabic word or Arabic data the words in "Refine your search" is not complete and appear in the end of the word "?" الطويل، تو�... الحضارة ال�... is there any way to permit viewing longer words in this part and i need to remove this symbol � Mohamed El ZalabanyIntegrated library systems consultant Zalabany Knowledge Systems Team© For Libraries and Information systems Development and support mh_zalabany@hotmail.com Mobile: 0111291444