Reports produced by the Standalone Report Designer tool are in XML format and do not support localization with RESX files - Localizing Reports
Localization can be done by adding a report parameter
which will provide information about the culture in the report. Then for each item in the report you will have to use a user function
obtaining the correct localized string based on the report parameter value, and a second argument pointing the key of the resource.
To extend the Standalone Designer to use an external assembly with user functions, please check Extending Report Designer
and the tutorials at the bottom of the article. The web application must be extended to load the external assembly in a similar way (the settings are listed in Previewing a report definition that uses an external assembly
I hope this information is helpful.
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