[Minor] fix non-localized string in installer (install_stg_buildindex_*); fix wrong string_id in pophelp:url_schemes
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>blank_page</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body class="mceContentBody">
</body>
</html>