It sounds like a do-it-yourself translation from someone who doesn't speak Irish.
Top of the morning to you!
"gaelach" should be "na nGael" "Ádh mór na nGael a thabhairt duit" means "To give you good Irish luck"
"Tá" means "Is / Are" "maith" means "good "Go maithe mo chara" means "May my friend forgive" "agus" means "and" "féin" mean "self" As a complete sentence it make no sense. It's probably a poor attempt at saying "Tá mé go maith a chara agus tú féin?" which means "I'm grand my friend and howare you?"
It should be eitherDia duit, a chara. (Hello, friend) orDia daoibh, a chairde. (Hello, friends) in Irish.
It means you tried to translate 'Happy St. Patrick's day to you all' using google translator.It should be Lá Fhéile Pádraig sona daoibh go léir.
And
Agus = and Cúpla = couple, twins Beag = little
"mora duit ar maidin" means "good morning" in Irish.
Cara means friend; a chara can mean 'his friend' or when addressing someone A chara, O friend. This is Irish Gaelic.
Duit means "for you" in Irish, but it depends on what you are saying. Examples: "Dia duit" - a greeting (usually for "hello") literally translates and "God for you" or "God be with you". "Tá sé seo duit" is "It/This is (here) for you". 'Duit' is the meaning in 'malay language' after translate to english
The phrase "Lá breithe sona duit" means "Happy Birthday to you" in Irish (Gaelic).