I’ve found how to rename my mkv files to have good metadata :
ex : Star.Wars.Episode.I.The.Phantom.Menace.1999.french.1080p.BluRay.x264.mkv
nameofthemovie : in french or original title, use dots to separate the words
year : useful to find the good movie
language : optional. DO NOT USE “MULTI” !
quality : not really useful to find metadata but really to know