Do name generation at client, fix localisation

Use existing group creation command

src/command_type.h

@@ -404,7 +404,6 @@ enum Commands {
 	CMD_DEPOT_MASS_AUTOREPLACE,       ///< force the autoreplace to take action in a given depot
 
 	CMD_CREATE_GROUP,                 ///< create a new group
-	CMD_CREATE_GROUP_AUTO_NAME,       ///< create a new group with an automatically generated name
 	CMD_DELETE_GROUP,                 ///< delete a group
 	CMD_ALTER_GROUP,                  ///< alter a group
 	CMD_CREATE_GROUP_FROM_LIST,       ///< create and rename a new group from a vehicle list