use official font awesome gem

app/assets/stylesheets/shared.scss

@@ -17,6 +17,8 @@
 @import "bootstrap-sprockets";
 @import "bootstrap";
 @import "bootstrap-social";
+
+@import "font-awesome-sprockets";
 @import "font-awesome";
 
 

app/views/landing/rooms.html.erb

@@ -77,12 +77,12 @@
     <button type="button" class="btn btn-default has-popover recording-update-trigger"
             data-placement="left" data-popover-body=".recording-visibility-popover"
             data-popover-title="<%= t('change_recording_visibility') %>">
-      <i class="fa fa-eye" aria-hidden="true"></i>
+      <%= icon('eye') %>
     </button>
     <a tabindex="0" role="button" class="btn btn-default has-popover delete-tooltip"
        data-placement="top" data-popover-body=".delete-popover-body"
        data-popover-title="<%= t('are_you_sure') %>">
-        <i class="fa fa-trash-o" aria-hidden="true"></i>
+        <%= icon('trash-o') %>
     </a>
   </div>
 </div>

app/views/shared/_meeting_url.html.erb

@@ -35,7 +35,7 @@
           data-copy-error="<%= t('copy_error') %>"
           data-copy-hint="<%= t('url_copy_explanation') %>"
         >
-          <i class="fa fa-clipboard" aria-hidden="true"></i>
+          <%= icon('clipboard') %>
         </button>
 
         <button type="button" class="btn btn-default meeting-invite has-tooltip pull-right"
@@ -43,7 +43,7 @@
           data-invite-body="<%= body %>"
           data-invite-subject="<%= subject %>"
         >
-          <i class="fa fa-envelope-o" aria-hidden="true"></i>
+          <%= icon('envelope-o') %>
         </button>
       </div>
     <% else %>
@@ -55,7 +55,7 @@
         data-copy-error="<%= t('copy_error') %>"
         data-copy-hint="<%= t('url_copy_explanation') %>"
         >
-        <i class="fa fa-clipboard" aria-hidden="true"></i>
+          <%= icon('clipboard') %>
       </button>
 
       <button type="button" class="btn btn-default meeting-invite has-tooltip"
@@ -63,7 +63,7 @@
         data-invite-body="<%= body %>"
         data-invite-subject="<%= subject %>"
       >
-        <i class="fa fa-envelope-o" aria-hidden="true"></i>
+        <%= icon('envelope-o') %>
       </button>
 
   </span>