Fix Eventhandler strings for translation

Change the generic representations of events in event handler to always have a full string to aid translation.

The aggregated list is then converted to be a simple list of single event generic descriptions to avoid string puzzles.

Fixes network/neochat#638

BUG: 466201, BUG: 491024

src/models/messageeventmodel.cpp

@@ -450,7 +450,7 @@ QVariant MessageEventModel::data(const QModelIndex &idx, int role) const
     }
 
     if (role == GenericDisplayRole) {
-        return EventHandler::genericBody(&evt);
+        return EventHandler::genericBody(m_currentRoom, &evt);
     }
 
     if (role == DelegateTypeRole) {