Some time ago the namespace of the pages in the Lexicanum category (help pages etc) were changed from "Lexicanum:Help" to "Warhammer - Age of Sigmar | Lexicanum:Help" and "Warhammer 40k | Lexicanum:Help".

Because there was no redirect all links to these pages have to be fixed (seen on all main pages of the wikis) and more importantly the vertical bar in the names messes up the pipe links.