Merge pull request #1186 from mozilla/issue_1185_select_email_string

Changing the "pick email" string to "sign in"

resources/static/dialog/views/authenticate.ejs

@@ -58,6 +58,6 @@
           <button class="start" tabindex="3"><%= gettext('next') %></button>
           <button class="newuser" tabindex="3"><%= gettext('verify email') %></button>
 
-          <button class="returning" tabindex="3"><%= gettext('select email') %></button>
+          <button class="returning" tabindex="3"><%= gettext('sign in') %></button>
       </div>
   </div>