You will find quite a few restaurants and tapas bars without English translations in Barcelona. See here for a pronuncation guide, and here for other useful words and phrases, and here for an online translator. And here for Catalan specialities and how to eat in Barcelona.
Castilian/Catalan/English
PESCADOS Y MARISCOS/PEIX, MARISC i CRUSTACIS/FISH and SHELLFISH
almejas/cloïsses/clams
anchoas/anxoves/anchovies
anguilas/anguiles/eels
atún/tonyina/tuna
bacalao/bacallà/salt cod
boquerones/seitons/fresh anchovies
Image by Javier Leiva