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In /includes/EditPage.php, arround line 870, where says $toolbar.="addInfobox('"
. addslashes( wfMsg( "infobox" ) ) . "','" . addslashes(wfMsg("infobox_alert"))
. "');\n";

addslashes( wfMsg( "infobox" ) ) works correctly but
addslashes(wfMsg("infobox_alert")) have some error because it doesn't print the
ending ' and ); wich causes the javascript to be erroneous and therefore, the
edit toolBar isn't show.

*** This bug has been marked as a duplicate of 1877 ***