Publisher provides the ability to create an XLIFF file from RTF templates. XLIFF is the XML Localization Interchange File Format, and is the standard format used by localization providers. Using Publisher's XLIFF generation tool you can generate the standard translation file of an RTF template.
You can then translate this file (or send to a translation provider). Once translated, the file can be uploaded to the report definition under the appropriate locale setting so that at runtime the translated report runs automatically for users who select the corresponding locale.