Currently, I only saw two languages on their site. One is English and the other one is Chinese but I like what you have suggested there, to add more language since I think that there are people who totally can't speak or understand English. That is if they want to grow as a gambling site..
Of course, it is not enough to have only two languages ??for a project that wants to seriously conquer new markets.
But here I will note that devs needs to make a lot of efforts to make normal translations. Moreover, this must be done from an interpreter and from the country where this language is the main one. A simple Google translator is not enough. And this, in turn, costs quite a lot. Here it is necessary to take into account the time to find a translator and pay for his work.
And you also need to check the quality of the translation, which also takes extra time.
Yes, although English is the universal language, you can also realize that another language is one of the most common and that it has a lot of communities that like games, and it is Spanish and Portuguese, as well as Italian, for many there is no problem in understanding English but there are people who have a lot of money and just because they don't have their language, the one they speak simply leaves and never comes back and it is very difficult to attract them again, something extraordinary would have to happen to that they come back, I say it in the sense that I know people around me that when they see English they leave, now if they see Chinese even more so.
For the best performance, it is of my opinion that it is absolutely necessary for any International platform, whether a gambling casino, a cryptocurrency exchange, a social media website or app etc, to make all languages available to their users, since they expect users from different works of life, it is a necessary step to take.
If a casino is local based, then having just one language or limited number is languages is understandable, but an international casino should make all necessary preparation for their international community.... It makes no sense loosing customers simply because of not having their language in the system.