A user can set the specific language for the data returned by API methods.
For that, it is necesary to add the lang=XX parameter to the API call.
For example http://cityads.com/api/rest/webmaster/xml/offers/web?remote_auth=6420072d37bf14f1df182d0fe0efa2d9&lang=en.
The list of available languages may be retrieved using languages-list method.
If there is no data in the selected language for an API response, then the data will be returned in English.