Enhance search filter UI for JS disabled users

Change filters UI box to use <details>.

Stylize detail button for filter ui

Fix localization for 'filter'

Fix CSS

Fix styling

src/invidious/views/search.ecr

@@ -2,18 +2,10 @@
 <title><%= search_query.not_nil!.size > 30 ? HTML.escape(query.not_nil![0,30].rstrip(".") + "...") : HTML.escape(query.not_nil!) %> - Invidious</title>
 <% end %>
 
-<h3>
-    <a id="togglefilters" href="javascript:void(0)">[ + ]</a>
-    <%= translate(locale, "filter") %>
-</h3>
-
-<noscript>
-    <style>
-        #filters {
-            display: flex;
-        }
-    </style>
-</noscript>
+<details id="filters">
+  <summary>
+    <a><h3 style="display:inline"> <%= translate(locale, "filter") %> </h3></a>
+  </summary>
 <div id="filters" class="pure-g h-box">
     <div class="pure-u-1-3 pure-u-md-1-5">
         <b><%= translate(locale, "date") %></b>
@@ -95,6 +87,7 @@
         <% end %>
     </div>
 </div>
+</details>
 
 <hr/>
 
@@ -141,4 +134,4 @@
         <% end %>
     </div>
 </div>
-<script src="/js/search.js?v=<%= ASSET_COMMIT %>"></script>
+<script src="/js/search.js?v=<%= ASSET_COMMIT %>"></script>