I could start a template, called "red link", which is to link to nonexistent pages, but prevent the page from showing on special:WantedPages. Its code is:
<span class="plainlinks">[{{fullurl:{{{1}}}|action=edit}} <span style="color: #ba0000">{{{2|{{{1}}}}}}</span>]</span>
It'll be mostly used on talk pages, and on Help:Magic words to remove MediaWiki:xyz from the list of wanted pages.
By making this edit, you added the template page Red link to the category Template documentation pages, but you stated it'll be easier to translate the documentation.
@Keyacom: I don't see what the point of this is, given that Special:WantedPages is already not clear due to various artifacts from the translate extension.
@Pppery: I wanted to create a template that, as described above, can remove MediaWiki:xyz from the Special:WantedPages. But for what you described, I redirect you to another topic.
My point is that the existence of {{Red link}} to remove one entry is premature until the broader problem described there, consisting of many more entries, is solved.