Orchard CMS 1.7 - Change in header does not appear on the site. Layout.cshtml issue

Orchard CMS 1.7 - Change in header does not appear on the site.
Layout.cshtml issue

I cannot figure out how to change a text in the header section of my site.
I am trying to do this in my custom module's theme. This is how my header
looks like:
<header>
<div class="container">
<div class="row-fluid">
<div id="Logo"><h1><a href="/" title="Go to
Home">@WorkContext.CurrentSite.SiteName</a></h1></div>
<h3>[ We Know Business ]</h3>
<a class="btn btn-navbar btn-menuh"
data-parent="#collapse-nav"
data-target=".collapse-menuh">btn</a>
<a class="btn btn-navbar btn-search"
data-parent="#collapse-nav"
data-target=".collapse-search">btn</a>
</div>
</div>
</header>
I changed [We Know Business] to [We know Businesses] but the updated text
is not coming up on any page of my site.
However, my main objective is to use HTML5 and Responsive compatibility in
IE8 by injecting conditional CSS and js like this:
<!--[if lt IE 9]>
<script src="/themes/intrust/js/html5shiv.js"></script>
<![endif]-->
I cannot see the above snippet in "View Source" option.
The reason I changed the text only to check whether I am doing it at the
right place or not. When it didn't work I turned Shape Tracing tool on to
see what template is being used for the header. But could not highlight
any part of the header at all!
Isn't Layout.cshtml of my custom theme liable to render the header
section? If not, which template I have to look for?
I must be doing something wrong here but cannot figure out what! Please help!
NB: I tried resetting IIS several times but had no luck either.