Add i18n and es/en locale

locales/en.json

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+{
+  "Score": "Score",
+  "Game Over": "Game Over!",
+  "Press any key to play again": "Press any key to play again",
+  "Angle": "Angle",
+  "Health": "Health",
+  "Player": "Player",
+  "Games": "Games",
+  "Player %s won!": "Player %s won!"
+}

locales/es.json

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+{
+  "Score": "Puntaje",
+  "Game Over": "Juego terminado!",
+  "Press any key to play again": "Pulsa cualquier tecla para volver a jugar",
+  "Angle": "Ángulo",
+  "Health": "Salud",
+  "Player": "Jugador",
+  "Games": "Juegos",
+  "Player %s won!": "El jugador %s ganó!"
+}