Hello,
1) Do you want to hide Add to cart button and q-ty and keep Buy now button only? Or you want to hide add to cart but keep q-ty and buy now button?
2) Use variation swatches to change the select to colors https://youtu.be/LgzC4iK-j6A
3) Translate XStore theme and also XStore core plugin https://www.8theme.com/documentation/xstore/theme-translation/base-theme-translation/
Regards