def set_fallback_locales(self, locales):
<EOL>self.catalogues = {}<EOL>for locale in locales:<EOL><INDENT>self._assert_valid_locale(locale)<EOL><DEDENT>self.fallback_locales = locales<EOL>
Sets the fallback locales.

@type locales: list[str]
@param locales: The falback locales

@raises: ValueError: If a locale contains invalid characters