Devs are not going to like what I ask there in the title. Because if you don't plan the application to be multi-language and support multiple character sets to begin with, there's more work afterward to adapt an existing app to add support for them.
Then, there's ongoing work to support multiple languages (keep translations in sync), and in some cases, there is a matter of reserving the right amount of space to accommodate translation in all languages, while not being too much space reserved in other translations. Probably the best way is to not reserve space at all, and have elements flow in a natural order, one after another. But that works if the UI was created this way, not if it has fixed positions and sizes.
Anyway, this is getting too technical for no reason, since devs already know what that would mean, most likely. And regular readers probably don't care much about these details.
Currently, on Hive I know Splinterlands has multi-language and multi-alphabet support. And even in Splinterlands' case, anyone using a non-English option would see the site was created for English speakers and then partially updated for other languages.
After checking, I saw Ecency also has multi-language support and it's very encouraging to see that. They also have quite a few languages supported (13 if I counted right), and others that aren't listed but for whom I see there are translators listed that contribute.
Back on the other chain, there was another application that started with multi-language support from the beginning. Quite a popular app, I used it too for a while: Busy app. It doesn't exist anymore and it was closed down before the split.
Why do I bring up the multi-language support now?
Because Hive began to stir encouraging levels of interest in the Spanish-speaking world.
Of the Spanish-speaking Hivers, I don't know how many are English speakers (some say they don't speak English and pretty much all of them use automated translators, which is not an indication of them speaking or not English). But for those who don't speak English I imagine using an interface in English is not their preference, but they have no choice.
Hive is already pretty difficult without having to learn the steps in a foreign language or using a translator at every step you make.
Maybe a poll among the Spanish-speaking community would be useful to see how many of them don't speak English.
There was an important development made these days to ease the transfer of HIVE and HBD at physical stores using the new Keychain Store mobile apps. But the apps are in English (edit: or Spanish for devices set up with Spanish language, stoodkev made clarifications in a comment), and the major utilization perspectives so far are in Latin America. Multi-language support to add Spanish would most likely be very helpful to grow the use of Keychain Store and transactions with HIVE and HBD in Latin America. I'm tagging 
What do you think? Would you use an interface in your native language, if it's other than English?
Personally, I wouldn't. Because I always felt translations in my own language sound awkward. But I have the advantage of knowing English. I bet I'd think differently if I didn't know English.
