"Everybody is wanting potatoes and herring."
Translation:Tha a h-uile duine ag iarraidh buntàta agus sgadan.
a h-uile is a package that means 'every' here a h-uile duine = every person or everyone or everybody. Exactly why the a is there, I can't tell you. It may have been lost in the mists of time, or it may be known to linguists who study it, but 'a' does a lot of work in the Gaelic. It does different things depending on context and use and to be honest it is probably easier at this time to remember a h-uile as a package, where yes as others have speculated the h is there as a spacer between the a and the u (apparently, according to Mark's dictionary if the noun following it begins with a vowel it can get an h- in front of it too)