So the 4-7 tier of trains from this is name "unknown key: entity-name.et-electric-locomotive-4 (Recipe)" And i don't know why

okay so I found a way to fix this... if you add:
et-electric-locomotive-4=E-locomotive 4
et-electric-locomotive-5=E-locomotive 5
et-electric-locomotive-6=E-locomotive 6
et-electric-locomotive-7=E-locomotive 7

after et-electric-locomotive-3=E-locomotive 3 in the locale config file in locale\en\base.cfg inside the Mod rar it adds the names to the 4 additional trains that this mod add to Electric Trains.
I don't know if the mod writer wants to add this or not.

okay so I found a way to fix this... if you add:
et-electric-locomotive-4=E-locomotive 4
et-electric-locomotive-5=E-locomotive 5
et-electric-locomotive-6=E-locomotive 6
et-electric-locomotive-7=E-locomotive 7

after et-electric-locomotive-3=E-locomotive 3 in the locale config file in locale\en\base.cfg inside the Mod rar it adds the names to the 4 additional trains that this mod add to Electric Trains.
turns out only the de locale has the name of the new trains.