I don't think that arcgisonline supports localized tiled services.But with Bing maps, you can change the labels by using the Culture property of the TileLayer.l
Concerning the geocoding, you have to use the appropriate geocoder which is managing the addresses for the region.For example, this geodocer gives results for french addresses:http://tasks.arcgisonline.com/ArcGIS/rest/services/Locators/TA_Address_EU/GeocodeServer/findAddressCandidates?Address=18+Avenue+des+Champs+Elys%C3%A9es&City=Paris&Postcode=&Country=France&outFields=&outSR=&f=html
<bing:TileLayer ID="BingLayer" LayerStyle="Road" Visible="True" ServerType="Production" Culture="fr-FR" Token="{StaticResource BingKeyString}" />
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