Merge branch 'wiki-empty-page-heading' into 'master'

Fix wiki empty page translation namespace not being removed

Closes #38920

See merge request gitlab-org/gitlab-ce!14759

app/views/projects/wikis/empty.html.haml

 - page_title _("Wiki")
 
-%h3.page-title= _("Wiki|Empty page")
+%h3.page-title= s_("Wiki|Empty page")
 %hr
 .error_message
   = s_("WikiEmptyPageError|You are not allowed to create wiki pages")