Go raibh míle maith agat as ucht an cuireadh (singular) / Go raibh míle maith agaibh as ucht an cuireadh (plural)
you say:"Thank you so much for this invitation"
It is correct English to say "thank someone for something" eg "My wife and I thank you for your kind invitation to your daughter's wedding"
merci madame or monsieur
The correct way to word an invitation is to say, "We request your kind presence at." The invitation does not need to say kind presence to be correct.
SAY iam praying from God keep you for me, forever.
Go raibh maith agat.
"Thank you in anticipation of your kind assistance."
You may say 'goshoukai arigatou gozaimasu.'
as gaeilge (in Irish) "Go raibh maith agat"
You can respond to the invite by expressing your gratitude and confirming your attendance. For example, you might say, "Thank you for the invitation! I am delighted to accept and look forward to attending." If you're unable to attend, you can say, "Thank you for the invite; unfortunately, I won't be able to make it, but I appreciate the invitation."
Go raibh maith agat, a ghrá.
To reply to an invitation in German, you can say "Danke für die Einladung!" (Thank you for the invitation!). If you want to accept, you can add "Ich komme gerne" (I would love to come). If you need to decline, you can say "Leider kann ich nicht kommen" (Unfortunately, I can't come).