fixed geo-location breaking chats and white text on white background

lib/api/marianumcloud/talk/chat/getChatResponse.dart

@@ -120,4 +120,5 @@ enum RichObjectStringObjectType {
   @JsonValue('guest') guest,
   @JsonValue('highlight') highlight,
   @JsonValue('talk-poll') talkPoll,
+  @JsonValue('geo-location') geoLocation,
 }

lib/api/marianumcloud/talk/chat/getChatResponse.g.dart

@@ -113,4 +113,5 @@ const _$RichObjectStringObjectTypeEnumMap = {
   RichObjectStringObjectType.guest: 'guest',
   RichObjectStringObjectType.highlight: 'highlight',
   RichObjectStringObjectType.talkPoll: 'talk-poll',
+  RichObjectStringObjectType.geoLocation: 'geo-location',
 };

lib/view/pages/talk/chatDetails/participants/participantsListView.dart

@@ -27,7 +27,7 @@ class ParticipantsListView extends StatelessWidget {
             children: [
               ListTile(
                 title: Text(entry.key.prettyName),
-                titleTextStyle: TextStyle(fontWeight: FontWeight.bold),
+                titleTextStyle: Theme.of(context).textTheme.titleMedium
               ),
               ...entry.value.map((participant) => ListTile(
                 leading: UserAvatar(id: participant.actorId),