fix(MC Authoring): Save changes to prompt. Also edited html default text

Author: hirokiterashima

src/app/services/htmlService.spec.ts

@@ -14,8 +14,8 @@ let service: HTMLService;
 describe('HTMLService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
-    imports: [],
-    providers: [
+      imports: [],
+      providers: [
         AnnotationService,
         ConfigService,
         ProjectService,
@@ -25,8 +25,8 @@ describe('HTMLService', () => {
         TagService,
         provideHttpClient(withInterceptorsFromDi()),
         provideHttpClientTesting()
-    ]
-});
+      ]
+    });
     service = TestBed.inject(HTMLService);
   });
   createComponent();
@@ -37,7 +37,7 @@ function createComponent() {
   it('should create an html component', () => {
     const component = service.createComponent();
     expect(component.type).toEqual('HTML');
-    expect(component.html).toEqual('Enter html here');
+    expect(component.html).toEqual('Enter content here');
   });
 }
 

src/assets/wise5/components/html/htmlService.ts

@@ -10,7 +10,7 @@ export class HTMLService extends ComponentService {
   createComponent() {
     const component: any = super.createComponent();
     component.type = 'HTML';
-    component.html = $localize`Enter html here`;
+    component.html = $localize`Enter content here`;
     return component;
   }
 

src/assets/wise5/components/multipleChoice/multiple-choice-authoring/multiple-choice-authoring.component.ts

@@ -36,6 +36,7 @@ export class MultipleChoiceAuthoring extends AbstractComponentAuthoring {
   protected feedbackTextChange: Subject<string> = new Subject<string>();
 
   ngOnInit(): void {
+    super.ngOnInit();
     this.subscriptions.add(
       this.choiceTextChange.pipe(debounceTime(1000), distinctUntilChanged()).subscribe(() => {
         this.componentChanged();

src/messages.xlf

@@ -20188,8 +20188,8 @@ Category Name: <x id="PH_1" equiv-text="categoryName"/></source>
           <context context-type="linenumber">7</context>
         </context-group>
       </trans-unit>
-      <trans-unit id="88232795223704551" datatype="html">
-        <source>Enter html here</source>
+      <trans-unit id="5588251132227750710" datatype="html">
+        <source>Enter content here</source>
         <context-group purpose="location">
           <context context-type="sourcefile">src/assets/wise5/components/html/htmlService.ts</context>
           <context context-type="linenumber">13</context>
@@ -20640,7 +20640,7 @@ Warning: This will delete all existing choices and buckets in this activity.</so
         </context-group>
         <context-group purpose="location">
           <context context-type="sourcefile">src/assets/wise5/components/multipleChoice/multiple-choice-authoring/multiple-choice-authoring.component.ts</context>
-          <context context-type="linenumber">75</context>
+          <context context-type="linenumber">76</context>
         </context-group>
       </trans-unit>
       <trans-unit id="6683126302760629027" datatype="html">