Call jitsi widgets 'group calls'

So they feel a bit more like first class citizens

src/TextForEvent.js

@@ -475,6 +475,10 @@ function textForWidgetEvent(event) {
     const {name: prevName, type: prevType, url: prevUrl} = event.getPrevContent();
     const {name, type, url} = event.getContent() || {};
 
+    if (type === 'jitsi' || prevType === 'jitsi') {
+        return textForJitsiWidgetEvent(event, senderName, url, prevUrl);
+    }
+
     let widgetName = name || prevName || type || prevType || '';
     // Apply sentence case to widget name
     if (widgetName && widgetName.length > 0) {
@@ -500,6 +504,24 @@ function textForWidgetEvent(event) {
     }
 }
 
+function textForJitsiWidgetEvent(event, senderName, url, prevUrl) {
+    if (url) {
+        if (prevUrl) {
+            return _t('Group call modified by %(senderName)s', {
+                senderName,
+            });
+        } else {
+            return _t('Group call started by %(senderName)s', {
+                senderName,
+            });
+        }
+    } else {
+        return _t('Group call ended by %(senderName)s', {
+            senderName,
+        });
+    }
+}
+
 function textForMjolnirEvent(event) {
     const senderName = event.getSender();
     const {entity: prevEntity} = event.getPrevContent();