The translation of "welcome to science in Irish" is Failte go Eolaiocht :)
bienvenido/a (adjective) bienvenida (welcome!)
There is no website where you can translate whole essays into Irish, you'll have to pay a translator.
"Willkommen"
Mathair.
Te
Erica doesn't translate into Irish
Bienvenue
Bienvenidos --teamhoyt
Witaj
ברוכים הבאים
You're welcome
The Irish speak English too...