Nowadays any viable product pursues the goal to grow globally. That means the successful online product is supposed to have minimum two language locales. One of them is english as an international language, and the other one depends on the spoken language of the target audience (usually domestic).
If you really want to get better at color, start studying it. Picking the right colors is something that might seem easy at first. And when you are starting down a color wheel, you are going to wish you had some information on what you are looking for.