Enable gettext translations
The new demandimport eliminates most of the gettext performance hit of
importing gettext, which was doubling the run time for 'hg'.
Now, with 'hg tip':
dummy: .09530s no translations: .09638s translations: .09755s
#header#
<title>Mercurial Error</title>
</head>
<body>
<h2>Mercurial Error</h2>
<p>
An error occured while processing your request:
</p>
<p>
#error|escape#
</p>
#footer#