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don't generate "user_description" on the host

the host it not capable to generate strings in the correct language.
("(Reserved for $playername)" was reolved on the host). Instead we now
generate the description on the clients.
dont overwrite "name" in mpconnect

and also remove unneeded code.
we not dont overwrite "name" (the name of the leader) in mp connect if
it given by the scenario.
We also fix a previous commit "don't generate 'user_description' on the
host" which caused that the AI algorithm wasn't shown to the clients.