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.