[Intervention] Revocations files optional #4

* makes revocation file upload optional
 * adds overview about revocations to intervention index
 * adds/updates translations

konova/static/css/konova.css

@@ -22,6 +22,10 @@ Declare some basic colours
     color:white;
 }
 
+.rlp-gd-inv{
+    color: var(--rlp-gray-dark);
+}
+
 .rlp-gd-outline{
     border:1px solid var(--rlp-gray-dark);
     color:var(--rlp-gray-dark);

konova/utils/tables.py

@@ -127,6 +127,17 @@ class BaseTable(tables.tables.Table):
             icon
         )
 
+    def render_stop(self, tooltip: str = None, icn_filled: bool = False):
+        """
+        Returns a stop icon
+        """
+        icon = "fas fa-ban rlp-r-inv" if icn_filled else "fas fa-ban rlp-gd-inv"
+        return format_html(
+            "<em title='{}' class='{}'></em>",
+            tooltip,
+            icon
+        )
+
     def render_icn(self, tooltip: str = None, icn_class: str = None):
         """
         Returns a rendered fontawesome icon