add back button

app/views/desktop/co_author_relations/index.html.erb

@@ -1,5 +1,6 @@
 <h1>Listing co_author_relations</h1>
 
+<%= submit_tag "Back", class: "bt-cancel fn_btn hh2 thmc2 thmtxt" %>
 <%= render 'form' %>
 
 <table id="co_author_relation_table">

app/views/desktop/co_authors/_form.html.erb

@@ -1,6 +1,6 @@
 <div class="fn_g hp">
   <%= f.submit "Save", name: "commit", value: "Save", class: "fn_btn hh2 thmc2 thmtxt" %>
-<!--    <%= submit_tag "Cancel", :class=>"fn_btn hh2 bt-cancel thmc2 thmtxt" %>-->
+  <%= submit_tag "Cancel", class: "bt-cancel fn_btn hh2 thmc2 thmtxt" %>
 </div>
 
 <div></div>