When I'm validating my XML I'm getting the above error:

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The XML provided is valid.

• No locale messages found. Locale messages are supported to internationalize the title, description, and thumbnail image of your application

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 The specification popup says "Locale - coming soon" , but the validation requires me to supply locale messages.

After I've added the above locale tag (as shown in openSocial reference):

 <Locale messages="http://XXX.XXX.XXX.XXX/shared/api/opensocial/languages/ALL_ALL.xml"/>

 I'm getting the above error:

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The XML provided is valid.

• The element "Locale" under "ModulePrefs" was not used. Xml:<Locale messages="http://80.179.48.202/shared/api/opensocial/languages/ALL_ALL.xml" />

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 I haven't seen any quatation about locale except the specification says "comming soon". 

Thanks,

Amir. 

This is not an error, it is just an informational message.  When it says, "The XML provided is valid." then you are good to go and anything listed are just messages about things you can add or are not used because they aren't supported.