It installs and executes, but I don't understand the language, so I can't read the messages. I would not expect it to work properly though, because Nintendo should only be willing to sell you the subscriptions that are available to your console's actual region (which the region-free hacks don't change.)
A lot of games have multiple languages to accommodate for the countries within the region. Depending on your console's settings X language will be chosen that is provided, as you stated, that the game itself has the files for X language.