Merge branch 'newsletter' into 'master'

Newsletter

/cc @JobV

source/contact/index.html

@@ -21,9 +21,7 @@ title: Contact
         <div id="mc_embed_signup" class="newsletter-form">
           <form action="https://gitlab.us5.list-manage.com/subscribe/post?u=498dccd07cf3e9482bee33ba4&amp;id=98a9a4992c" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate="">
             <div class="mc-field-group">
-              <label for="mce-EMAIL">Please enter your email address:
-              </label>
-              <input type="email" value="" name="EMAIL" class="required email form-control" id="mce-EMAIL">
+              <input type="email" value="" name="EMAIL" class="required email form-control" id="mce-EMAIL" placeholder="Your email address">
             </div>
             <div id="mce-responses" class="clear">
               <div class="response" id="mce-error-response" style="display:none"></div>