添加关注、取消关注、获取关注列表、粉丝列表相关接口

src/main/resources/messages_en.properties

@@ -139,6 +139,11 @@ slogan.style.cannot.be.empty=Slogan style text cannot be empty.
 slogan.image.cannot.be.empty=Slogan image cannot be empty.
 questionnaire.filled.out=You have filled out the current questionnaire.
 user.has.no.account=The current user has no account！
+you.cannot.follow.yourself=You cannot follow yourself
+you.have.already.followed.this.user=You have already followed this user
+subscription.success=Subscription Success
+unsubscribe.success=Unsubscribe Success
+you.have.not.followed.the.current.user=You have not followed the current user
 
 # 可能会报异常
 # Informative: