Fix rendering error on post interactions by ensuring utf8 decoding of result

lib/friendica_client.dart

@@ -299,7 +299,7 @@ class FriendicaClient {
             type: ErrorType.authentication,
             message: '${response.statusCode}: ${response.reasonPhrase}'));
       }
-      return Result.ok(response.body);
+      return Result.ok(utf8.decode(response.bodyBytes));
     } catch (e) {
       return Result.error(
           ExecError(type: ErrorType.localError, message: e.toString()));