Wow!! You really need to get out more often!! :-)
Well, there's an Irish/English dictionary at
http://www.crannog.ie . Also a bank of technical terms English/Irish at
http://www.acmhainn.ie I don't know of any German to Irish dictionaries.
I hope this helps and stay tuned, there's bound to be a few experts in this field along at some stage.
This might be of interest too, maybe:
http://www.focloir.ie Bail ó Dhia ar an obair, a chara.