Some more translations and small change in init.php

When i install playSMS in a folder inside www. Everything works fine, but when I install it directly in the root, a extra slash is added preventing the normal load of css and js as you can see below:
    script type="text/javascript"
	    src="http://myurl//plugin/themes/play/jscss/bootstrap-scrollspy.js"></script>
    <!-- Le styles -->
    link href="http://myurl//plugin/themes/play/jscss/bootstrap.css" rel="stylesheet"
    <!-- play styles -->
    link href="http://myurl//plugin/themes/play/jscss/play.css" rel="stylesheet"