If you’re not familiar with the name Ben Gailing, it could be because you’re not old enough, you were never a fan of variety radio shows, or you don’t speak Yiddish. Gailing, who died in 1999 at the age of 100, was a special sort of Boston radio personality. His weekly program, the “Yiddish Radio Show,” featuring songs and skits and jokes and editorials – all in Yiddish – ran in Boston, initially on WDLW, on Sunday mornings from 1932 till 1999.