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alan1972
It's all rather prosaic:
"lionn dubh dúbalta" is something like "double (strength) black beer" or "stout".
"Geata San Séamuis Áth Cliath" is Saint James's Gate, Dublin.
"ár n a cur i mbuideil ag": bottled at (followed by an address I can't make out).
"Ná cuireann i mbuidéil aon lionn dubh ná pórtair eile": they don't bottle any other stour or porter.
(Here I've used the modern practice of writing a h instead of a dot over a letter, for example at the end of Áth - some of the dots seem to be missing or unclear in your example).
Pro tip
Lonely Planet
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