Cb Connector is the next version of phpbb connector... just uninstall phpbb connector before installing CB Connector
Installation should be:
1) Make sure phpbb connector is uninstalled
2) Install CB Connector in CB Plugins
3) Verify settings are per needs
4) Use CB Connector...
As far as spanish... nobody has submitted a spanish language file yet... If you are able you can go to cbconnector.com and there is a topic asking for files... download the english and translate to spanish and I will include in the final CBC v2.