Capture client javascript errors with sentry too

webapp/titanembeds/templates/embed.html.j2

@@ -336,6 +336,8 @@
     <script src="{{ url_for('static', filename='js/vendor/emoji.min.js') }}"></script>
     <script src="{{ url_for('static', filename='js/vendor/wdt-emoji-bundle.min.js') }}"></script>
 
+    {% include 'sentry_js_init.html.j2' %}
+
     {% raw %}
     <script id="mustache_channellistings" type="text/template">
       <li><a class="waves-effect truncate" id="channel-{{channelid}}"><span class="channel-hash">#</span> {{channelname}}</a></li>

webapp/titanembeds/templates/sentry_js_init.html.j2

@@ -0,0 +1,4 @@
+<script src="https://cdn.ravenjs.com/3.26.2/raven.min.js" crossorigin="anonymous"></script>
+<script>
+  Raven.config({{ sentry_js_dsn|tojson|safe }}).install();
+</script>

webapp/titanembeds/templates/site_layout.html.j2

@@ -93,6 +93,8 @@
     <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.100.2/js/materialize.min.js" integrity="sha256-uWtSXRErwH9kdJTIr1swfHFJn/d/WQ6s72gELOHXQGM=" crossorigin="anonymous"></script>
     
+    {% include 'sentry_js_init.html.j2' %}
+    
     {% if not dbl_voted or (dbl_voted and request.path == "/") %}
     <script>
       $(document).ready(function () {