Updating subscribe form input to be required, updating text in download modal

src/_includes/modals/download.html

@@ -1,26 +1,23 @@
 <div class="modal fade" id="modal-download" tabindex="-1" role="dialog" aria-labelledby="modal-download-label">
-  <div class="modal-dialog modal-md" role="document">
+  <div class="modal-dialog" role="document">
     <div class="modal-content">
       <div class="modal-header">
         <button type="button" class="close" data-dismiss="modal" aria-label="Close"><i class="fa fa-times"></i></button>
         <h2 class="modal-title" id="modal-download-label">Help Us Out!</h2>
       </div>
-      <div class="modal-body text-md">
-        <p class="padding-bottom-sm">
+      <div class="modal-body text-lg">
+        <p class="margin-bottom-lg">
           I hope you love Font Awesome. If you've found it useful,
           <a class="strong" href="https://fonticons.com/?utm_source=font_awesome_homepage&utm_medium=display&utm_content=download_modal&utm_campaign=promo_4.3_update" target="_blank">
-            please do me a favor and check out my latest project, Fonticons
-          </a>. It makes it easy to put the perfect icons on your website. Choose from our awesome, comprehensive icon
-          sets or copy and paste your own.
+            please do me a favor and check out my latest project, Fonticons</a>. It makes it easy to put the perfect
+          icons on your website. Choose from our awesome, comprehensive icon sets or copy and paste your own.
         </p>
 
-        <p class="padding-bottom-sm">
+        <p class="margin-bottom-lg">
           Please. Check it out.
         </p>
 
-        <p class="padding-bottom-sm">
-          -Dave Gandy
-        </p>
+        <p>&mdash;Dave Gandy</p>
       </div>
       <div class="modal-footer">
         <a class="btn btn-default btn-lg block-xs" href="{{ page.relative_path }}assets/font-awesome-{{ site.fontawesome.version }}.zip"

src/_includes/stripe-social.html

@@ -3,7 +3,7 @@
     <form method="post" action="https://formkeep.com/f/ba101f5b69f0">
       <div class="row">
         <div class="col-md-4 col-md-offset-2 col-sm-6">
-          <input name="email" type="email" class="form-control margin-bottom" id="email" placeholder="Enter your email address&hellip;">
+          <input name="email" type="email" class="form-control margin-bottom" id="email" placeholder="Enter your email address&hellip;" required>
         </div>
         <div class="col-md-4 col-sm-6">
           <button type="submit" class="btn btn-success btn-block margin-bottom-lg"