I'm no help in translating. But it shows somewhat how parts go together. I see they just had some silicone for a gasket on the end case, not a good idea. I would use the normal 8 thousandths paper gasket and check the internal end clearances. Putting the shafts in the main case and fishing the shifter forks into position with a coat hanger is not hard at all ( A cheap harbor freight spring installation hook tool works too). To each his own, but I would not do it that way. Without knowing what they were saying I do not know if they mentioned to replace the shifter spring or to shim the shifter drum properly, both kind of important.
