Add confirmation dialog to Subject save

src/main/webapp/app/entities/subject/subject-update.component.ts

@@ -70,7 +70,14 @@ export default defineComponent({
   created(): void {},
   methods: {
     save(): void {
+      const message = this.subject.id ? '이 과목의 수정 내용을 저장하시겠습니까?' : '새 과목을 등록하시겠습니까?';
+
+      if (!window.confirm(message)) {
+        return;
+      }
+
       this.isSaving = true;
+
       if (this.subject.id) {
         this.subjectService()
           .update(this.subject)