Button print subsection styling

common/lib/xmodule/xmodule/css/capa/display.scss

@@ -144,7 +144,7 @@ div.problem-progress {
   font-size: em(14);
 }
 
-div.problem-wrapper {
+div.problems-wrapper {
     @media print {
         page-break-inside: avoid;
     }

common/lib/xmodule/xmodule/js/src/sequence/display.js

@@ -75,7 +75,7 @@
             this.$('#sequence-list .nav-item').on('focus mouseenter', this.displayTabTooltip);
             this.$('#sequence-list .nav-item').on('blur mouseleave', this.hideTabTooltip);
             // lol hackathon
-            $('.print-submodule').click($.proxy(this.printSubmodule, this));
+            $('.print-subsection').click($.proxy(this.printSubmodule, this));
         };
 
         Sequence.prototype.previousNav = function(focused, index) {

lms/static/sass/shared/_header.scss

@@ -914,7 +914,7 @@
     display: inline-block;
   }
 
-  .print-submodule {
+  .print-subsection {
     float: right;
     display: inline-block;
 

lms/templates/courseware/courseware.html

@@ -182,7 +182,7 @@ ${HTML(fragment.foot_html())}
                     </div>
                 </nav>
             </div>
-            <button class="btn print-submodule">Print Submodule</button>
+            <button class="btn print-subsection"><span class="icon fa fa-print" aria-hidden="true"></span> Print Subsection</button>
         </header>
 
         <main id="main" tabindex="-1" aria-label="Content">