Got it to run, renamed some template stuff

Now onto the Jellyfin API, yay!

data/interfaces/default/newsletters_table.html

@@ -9,7 +9,7 @@ Version:            0.1
 DOCUMENTATION :: END
 </%doc>
 
-<% from plexpy import newsletter_handler %>
+<% from jellypy import newsletter_handler %>
 <ul class="stacked-configs list-unstyled">
     % for newsletter in sorted(newsletters_list, key=lambda k: (k['agent_label'], k['friendly_name'], k['id'])):
     <li class="newsletter-agent pointer" data-id="${newsletter['id']}">