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',
 };