The Drupal core "Who's new" block in a multilingual site always displays the users' real names in the site's default language.

I'm opening this issue as a support request and in the RealName project's issue queue because I don't know if this is a bug or a feature request and whether it belongs to Drupal core, i18n (i18n_block in particular), entity_translation or whatever???...

I don't know if the core "Who's new" block is language-aware when it comes to the content it displays. I managed to translate the real name field of users and now the block displays real names instead of account names, but it always displays them in the site's default language no matter what language the site is switched to. So when the site's language is English, the block's title is English too and the user real names are listed in their English version as well. If I switch the site to Italian, the block's title is in Italian (as expected), but the users' names are listed in English. If I set the site's default language to Italian, it happens the other way around: the block's title follows the site's language, but the user's real names are always in Italian.

So, what am I doing wrong? Is this a bug? Should I file it as a feature request instead? Can it be solved in this project here, or should it be switched to core/i18n/whatever???