The new UserLogin shows red links everywhere. I assume this was done to compensate the removal of the wall of text on en.wiki, but it's not nice: on most wikis those help pages won't exist and are not needed (username policy), or are needed but shouldn't exist locally (logging in; bug 43591), or exist but under another title (every Wikipedia except en.wiki; it.wiki has been fixed, fr.wiki not yet, most Wikipedias will never be fixed).
Simple solution: kill the links (e.g. createacct-helpusername-link) and leave them to customisations of the preceding messages (e.g. userlogin-yourname), which need to parse links and also some HTML if the grey is absolutely needed, and possibly to be copied to a new key if they're recycled from previous interface.
Complex solution: identify if the page exist and don't link it if it doesn't and/or link to MediaWiki.org, e.g. https://www.mediawiki.org/wiki/Help:Logging_in .