fix(ivy): i18n - handle translated text containing HTML comments (#32475)

Fixes FW-1536

PR Close #32475

Author: petebacondarwin

packages/compiler-cli/test/compliance/r3_view_compiler_i18n_spec.ts

@@ -169,7 +169,7 @@ const verify = (input: string, output: string, extra: any = {}): void => {
   }
 };
 
-describe('i18n support in the view compiler', () => {
+describe('i18n support in the template compiler', () => {
 
   describe('element attributes', () => {
     it('should add the meaning and description as JsDoc comments', () => {
@@ -943,6 +943,24 @@ describe('i18n support in the view compiler', () => {
       verify(input, output, {exceptions});
     });
 
+    it('should ignore HTML comments within translated text', () => {
+      const input = `
+        <div i18n>Some <!-- comments --> text</div>
+      `;
+
+      const output = String.raw `
+      var $I18N_0$;
+      if (ngI18nClosureMode) {
+          const $MSG_EXTERNAL_0$ = goog.getMsg("Some  text");
+          $I18N_0$ = $MSG_EXTERNAL_0$;
+      }
+      else {
+          $I18N_0$ = $localize \`Some  text\`;
+      }
+    `;
+      verify(input, output);
+    });
+
     it('should properly escape quotes in content', () => {
       const input = `
         <div i18n>Some text 'with single quotes', "with double quotes" and without quotes.</div>

packages/compiler/src/render3/view/i18n/localize_utils.ts

@@ -44,7 +44,12 @@ class PlaceholderPiece extends MessagePiece {
  */
 class LocalizeSerializerVisitor implements i18n.Visitor {
   visitText(text: i18n.Text, context: MessagePiece[]): any {
-    context.push(new LiteralPiece(text.value));
+    if (context[context.length - 1] instanceof LiteralPiece) {
+      // Two literal pieces in a row means that there was some comment node in-between.
+      context[context.length - 1].text += text.value;
+    } else {
+      context.push(new LiteralPiece(text.value));
+    }
   }
 
   visitContainer(container: i18n.Container, context: MessagePiece[]): any {