There are separate translations for Spain, Mexico, Chile, Argentina, among others. However, I don’t understand the need to give each one its own unique translation. What I have found is that most of them are poorly translated and often leave many elements still in English. There is only really a difference between these dialects in informal speech (talk among friends, slang, expressions, etc.); formal Spanish is understood everywhere. Even works with informal speech such as books, movies, games, etc. only separate their Spanish translations between European and Latin American Spanish as making one for each region is just unnecessary. This is also the way many websites (Google, Facebook, and co.) separate their localizations, although even then some sites only have one Spanish translation as the two (again, in formal speech) are identical.
I propose that DuckDuckGo unifies all the Spanish translations into just Spanish, or at least just keep European and Latin American Spanish if you find that your site makes a lot of jokes and friendly talk to its users. A separate “Region” setting can be used to determine what currency, time zone, clock format, measuring system, and relevant search results are used (or just let the user determine these options individually). Having just one or two Spanish translations means more eyes can keep track of what needs work and more translation suggestions will be provided in general. Of all the Spanish translations, Spain Spanish seems to be the best one (I’m talking about the total number of elements translated and their accuracy and grammatical correctness, not about the dialect being better or anything, if anyone thinks that), although even it has some issues here and there. I therefore suggest that if you’re going to go the one-Spanish route, you should use Spain Spanish as the basis. Otherwise, use Spain Spanish as the basis for European Spanish and Mexican Spanish as the basis for Latin American Spanish. I believe this will help with the quality of the translations greatly (again, because more eyes will be looking) and therefore make DuckDuckGo more appealing to Spanish-speaking users.