ਮੀਡੀਆਵਿਕੀ:Apihelp-query+allmessages-param-includelocal

Also include local messages, i.e. messages that don't exist in the software but do exist as in the ਮੀਡੀਆਵਿਕੀ namespace. This lists all ਮੀਡੀਆਵਿਕੀ-namespace pages, so it will also list those that aren't really messages such as Common.js.