Changing Mediawiki PAGENAME independently from URL

There is some page in Mediawiki:

/wiki/index.php/some_page

and the page name (under article and discussion tabs) is the same, but without underscore:

some page

Is it possible to change displayed page name without changing 开发者_运维问答url? And if yes, then how?

See the {{DISPLAYTITLE}} magic word and $wgRestrictDisplayTitle.