Table filters

* adds table filtering for InterventionTable
* adds default ordering
* moves user-access filtering from view to InterventionTableFiler
* adds generic render_icn method for BaseTable (for usage with fontawesome5)
* adds translations
* improves table.html template

konova/static/css/konova.css

@@ -37,6 +37,10 @@ Declare some basic colours
     color:var(--rlp-red);
 }
 
+.rlp-r-inv{
+    color:var(--rlp-red);
+}
+
 html {
   position: relative;
   min-height: 100%;