Select Language At Signup not rendering

Hi there,

I've installed the Select Language At Signup plugin in mu-plugins and created a languages directory in wp-content but the option for designating a language isn't rendering on my signup page like it looks in this illustration.

https://premium.wpmudev.org/project/select-language-at-signup

I thought it might be because of various other registration captchas and defenders I have installed causing a conflict so I deactivated them all but the plugin is still not rendering. Any idea what the conflict is? And speaking of such registration captchas, is there one which will work best with this plugin?

Thanks