|Image credit: Jeltovski|
Some would respond with It's nice to meet you too, you too or just grunt but this is simply to add an additional word to the end of the greeting.
In Irish the greeting can be tá sé go deas bualadh leat, and the response can be tá sé go deas bualadh leatsa
- with the bonus sé go deas bualadh leatsa chomh maith! if you want to show off ;-)
So the surprise to me was the addition of the sa sound for emphasis, rather than simply adding an additional word to the end. It's another example to me of how the Irish language is formed differently to English.
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