Are you planning to support "dialects" like English-GB vs English-US. Spanish is also complicated. [Hi from Argentina!]. The usual classification is Spanish-ES vs Spanish-latin-america, but Latin America is big and each country is slightly different (an even each city is different). I'm not sure about the best way to split it.
When my oler daughter was young, we used something like this to teach her English. She saw a movie in DVD a few times in Spanish and then in English a few times.
When my oler daughter was young, we used something like this to teach her English. She saw a movie in DVD a few times in Spanish and then in English a few times.