core&ui: fix bugs and add hint (#635)

Co-authored-by: panda <panda_dtdyy@outlook.com>

packages/hydrooj/locales/en.yaml

@@ -42,11 +42,13 @@ homework_main: Homework
 homework_scoreboard: Scoreboard
 judge_playground: Judge Playground
 main: Home
+manage_config: System Configurations
 manage_dashboard: System
 manage_module: Module Management
 manage_script: Scripts
 manage_setting: System Settings
 manage_user_import: Import Users
+manage_user_priv: User Privilege
 manage: System Manage
 no_translation_warn: <blockquote class="warn">This part of content is under translation.</blockquote>
 page.problem_detail.sidebar.show_category: Click to Show

packages/hydrooj/src/handler/discussion.ts

@@ -322,7 +322,10 @@ class DiscussionDetailHandler extends DiscussionHandler {
     @param('drrid', Types.ObjectId)
     async postDeleteTailReply(domainId: string, drid: ObjectId, drrid: ObjectId) {
         const deleteBy = this.user.own(this.drrdoc) ? 'self' : 'Admin';
-        if (!this.user.own(this.drrdoc)) this.checkPerm(PERM.PERM_DELETE_DISCUSSION_REPLY);
+        if (!(this.user.own(this.drrdoc)
+            && this.user.hasPerm(PERM.PERM_DELETE_DISCUSSION_REPLY_SELF))) {
+            this.checkPerm(PERM.PERM_DELETE_DISCUSSION_REPLY);
+        }
         const msg = JSON.stringify({
             message: 'Admin {0} delete your discussion tail reply {1} in "{2}"({3:link}).',
             params: [