Hi Colin,
In Spanish speaking countries (at least in Spain, not sure about the others) some dice or poker names are not translated, so "Full House" or "Full" remains the same. Even if the translations are literally correct and one could deduce what they mean, IMO it would be better:
3 de una clase: very literal but totally understandable. It would also be correct '3 iguales' or 'Trio'
4 de una clase: the same. Also correct '4 iguales' or 'Poker'
Casa llena: definitely incorrect, even if in some places it is also automatically translated this way --> 'Full house' or 'Full'
Recto pequeño: incorrect, I'd say 'Escalera pequeña'
Recta grande: same as before, it would be 'Escalera grande'
Five dice!: ok
Oportunidad: I'd leave it as 'Chance'. If not, 'Suerte' or 'Suma' (what it is really)
Prima: I'd leave the word 'Bonus', as it is universal
Roll 1 .... : 'Lanzar dados (1)' ...
I'll take a deeper look to the app this weekend