Use double quotes in app/views

app/views/follows/_follow_button.html.erb

@@ -1,11 +1,11 @@
 <div class="js-follow">
   <span class="followable-content">
     <% if follow.followable.followed_by?(current_user) %>
-      <%= link_to t('shared.following'),
+      <%= link_to t("shared.following"),
                   follow_path(follow),
                   method: :delete, remote: true,
                   title: unfollow_text(follow.followable),
-                  class: 'button expanded' %>
+                  class: "button expanded" %>
 
     <% else %>
       <%= link_to follow_text(follow.followable),
@@ -13,7 +13,7 @@
                                followable_type: follow.followable.class.name),
                   method: :post, remote: true,
                   title: follow_text(follow.followable),
-                  class: 'button hollow expanded' %>
+                  class: "button hollow expanded" %>
     <% end %>
   </span>
 </div>