Dear Mehdi Allani,
Please do the following steps:
+ go to "templates\sj_worldnews\templateDetails.xml", finding:
<field name="font_name" type="list" default="arial" label="FONT_NAME_LABEL" description="FONT_NAME_DESC" >
<option value="arial">Arial</option>
<option value="arial-black">Arial Black</option>
<option value="courier">Courier New</option>
<option value="georgia">Georgia</option>
<option value="impact">Impact</option>
<option value="lucida-console">Lucida Console</option>
<option value="lucida-grande">Lucida Grande</option>
<option value="lucida-sans">Lucida Sans</option>
<option value="palatino">Palatino</option>
<option value="tahoma">Tahoma</option>
<option value="times">Times New Roman</option>
<option value="trebuchet">Trebuchet</option>
<option value="verdana">Verdana</option>
</field>
=>
<field name="font_name" type="list" default="arial" label="FONT_NAME_LABEL" description="FONT_NAME_DESC" >
<option value="arial">Arial</option>
<option value="arial-black">Arial Black</option>
<option value="courier">Courier New</option>
<option value="georgia">Georgia</option>
<option value="impact">Impact</option>
<option value="lucida-console">Lucida Console</option>
<option value="lucida-grande">Lucida Grande</option>
<option value="lucida-sans">Lucida Sans</option>
<option value="palatino">Palatino</option>
<option value="tahoma">Tahoma</option>
<option value="times">Times New Roman</option>
<option value="trebuchet">Trebuchet</option>
<option value="verdana">Verdana</option>
<option value="hacen_tunisia">Hacen Tunisia</option>
</field>
+ go the administrator => Extensions => Template Manager => sj_worldnews - Default => Style Settings tab => choose Google Font-Family as
None Select => choose Google Font-Family as
Hacen Tunisia
Thanks