Installed: 0.0.9-1~iiamsn5
To be installed(it says something here but its in greek so don't know how they say it in english...): 0.0.9-1~iiamsn5
Strange ! if farsight2 is installed I don't understand why aMsn is complaining.
When you set your audio/video preferences there is no problems ? no messages ?
PS : BTW the english translation is candidate

Little tip try LANG=C command eg :
LANG=C apt-cache policy libgstfarsight0.10-0