You just need the Common Tongue (this is English). If you are also fluent in Spanish you may improve your chances. I honestly do not believe that it makes a big difference since the profile of the average person who will solve this riddle more easily is not linked at all with being able to understand Spanish.
Dos suertes deslizan, por turnos madera
Balance and rhythm and neurones on fire
destino ligado,contraste y contienda
this is a riddled double-wire
partida perfecta, santo grial
with only your language you'll have to guess
dos a la sexta ¿Quién es tal?
the question is clear: who's Tal in …?