修复若干bug，优化若干代码

apps/comments/apps.py

@@ -4,3 +4,4 @@ from django.apps import AppConfig
 class CommentsConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'apps.comments'
+    verbose_name = '弹幕管理'

apps/comments/serializers.py

@@ -1,6 +1,6 @@
 from rest_framework import serializers
 from .models import *
-from utils.get_msg import get_msg
+from utils.util import get_msg
 
 
 class CommentsInfo(serializers.ModelSerializer):

apps/comments/views.py

@@ -7,7 +7,7 @@ from rest_framework.response import Response
 from .models import *
 from .serializers import CommentsInfo
 from django.utils import timezone
-from utils.get_msg import get_msg
+from utils.util import get_msg
 from django.views.decorators.csrf import csrf_exempt
 # Create your views here.