Looking at the Itemnames.csv that comes with your EE mod and comparing it with the german version, I've seen that that the numbers (1,2,3) differ in various places. What do these numbers refer to?
I'd also propose minor changes for the german Itemnames.csv (if possible):
NGCLF_BRACERS_TENERGY;Scarthinarmschienen,2;Scarthinunterarmschützer,2;Scarthinellbogenschützer,2
NGCLF_RECURVEBOW;Recurvebogen,1;Schwerer Recurvebogen,1;Verstärkter Recurvebogen,1
These names should be written together, which would also be in line with the other itemname files
NGCLF_WHIP;Peitsche,2;Karbatsche,2;Jadgpeitsche,2
Just for the sake of not repeating the first entry again.