When we delete a page has a history, a warning is shown. Its text in English is
"Warning: The page you are about to delete has a history:" (historywarning), and
after it comes the link "Page history" (history). However, there is no space
between historywarning and history, and it looks odd. Please fix it in the page
(not in Messages.php, because that's a workaround, but in the page itself), in
MAIN and REL1_6.