I enabled both plugins and the login modules now shows the Email field instead of the username. I have a question regarding the registration module however: I did the 5 language overrides, but the registration module asks for one username field and two email fields. Should the username field be suppressed? Or should it's title be replaced by "Email"? But what with the two email fields the module asks for?
On a sidenote: when installing from the "Install from web" tab, the language file seems to be absent as I saw things like: PLG_AUTH_EMAIL_XML_DESCRIPTION