Arabic labels do not display correctly in Geoserver

I have geoserver installed with Tomcat and the text labeling do not display correctly . where can i set the Arabic encoding in geosever? the labeling appear well in QGIS but when i publish it in geoserver i get this problem .

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The shape file Here Is the SLD :

   <?xml version="1.0" encoding="UTF-8"?>
<sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:sld="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" version="1.0.0">
    <sld:UserLayer>
        <sld:LayerFeatureConstraints>
            <sld:FeatureTypeConstraint/>
        </sld:LayerFeatureConstraints>
        <sld:UserStyle>
            <sld:Name>sea</sld:Name>
            <sld:Title/>
            <sld:IsDefault>1</sld:IsDefault>
            <sld:FeatureTypeStyle>
                <sld:Name>group 0</sld:Name>
                <sld:FeatureTypeName>Feature</sld:FeatureTypeName>
                <sld:SemanticTypeIdentifier>generic:geometry</sld:SemanticTypeIdentifier>
                <sld:SemanticTypeIdentifier>simple</sld:SemanticTypeIdentifier>
                <sld:Rule>
                    <sld:Name>default rule</sld:Name>
                    <sld:PolygonSymbolizer>
                        <sld:Fill>
                            <sld:CssParameter name="fill">#1B9E77</sld:CssParameter>
                            <sld:CssParameter name="fill-opacity">0.5</sld:CssParameter>
                        </sld:Fill>
                        <sld:Stroke>
                            <sld:CssParameter name="stroke">#1B9E77</sld:CssParameter>
                        </sld:Stroke>
                    </sld:PolygonSymbolizer>
                    <sld:TextSymbolizer>
                        <sld:Label>
                            <ogc:PropertyName>ARABIC</ogc:PropertyName>
                        </sld:Label>
                        <sld:Font>
                            <sld:CssParameter name="font-family">Arial</sld:CssParameter>
                            <sld:CssParameter name="font-size">12.0</sld:CssParameter>
                            <sld:CssParameter name="font-style">normal</sld:CssParameter>
                            <sld:CssParameter name="font-weight">bold</sld:CssParameter>
                        </sld:Font>
                        <sld:LabelPlacement>
                            <sld:PointPlacement>
                                <sld:AnchorPoint>
                                    <sld:AnchorPointX>0.5</sld:AnchorPointX>
                                    <sld:AnchorPointY>0.5</sld:AnchorPointY>
                                </sld:AnchorPoint>
                            </sld:PointPlacement>
                        </sld:LabelPlacement>
                        <sld:Fill>
                            <sld:CssParameter name="fill">#000000</sld:CssParameter>
                        </sld:Fill>
                        <sld:VendorOption name="spaceAround">2</sld:VendorOption>
                    </sld:TextSymbolizer>
                </sld:Rule>
            </sld:FeatureTypeStyle>
        </sld:UserStyle>
    </sld:UserLayer>
</sld:StyledLayerDescriptor>

The most common problem is that you have miss set the character encoding, check the store page:

With my test data I get this with a setting of "windows-1250"

Switching to the (in my case) correct "UTF-8" gives this, which is better.

And finally using a "better" font than Arial (Trocchi) fills out the Chinese as well as the Arabic characters.

Update

So experimenting with your shapefile and SLD and googling "windows arabic character set" led me to setting the Shapefile datastore DBF character set to "Windows-1256" which seems to work.