clearer wording and formatting

apps/registration/registration_success.html

@@ -19,7 +19,7 @@
     <section id="main" class="wrapper" style="padding: 1em 3em 3em 3em;">
       <h1>Welcome</h1>
       <div>
-        <p> Welcome to the HTT project! Your login is your email<span id="email_address"></span>. You should receive an email at the address used in registration with instructions on how to set your password. <br /> Initially, this account will have limited "public" access. Then, an HTT administrator will assign you to an updated role and email you about next steps. <br />
+        <p> Welcome to the HTT project! Your login username is your email<span style="font-weight: bold;" id="email_address"></span>. You should receive an email at the address used in registration with instructions on how to set your password. <br /> Initially, this account will have limited "public" access. Then, an HTT administrator will assign you to an updated role and email you about next steps. <br />
           <br /> Please <a href="mailto:[email protected];[email protected];[email protected]?subject=HTT Registration Question">contact the administrative team</a> with any questions. <br />
           <br /> Thank you for registering.
         </p>