docs(material/datepicker): import used locales in example (#22784)

(cherry picked from commit 70c050c)

Author: mmalerba

rollup-globals.bzl

@@ -73,6 +73,8 @@ ROLLUP_GLOBALS = {
     # Third-party libraries.
     "kagekiri": "kagekiri",
     "moment": "moment",
+    "moment/locale/fr": "moment.locale.fr",
+    "moment/locale/ja": "moment.locale.ja",
     "protractor": "protractor",
     "rxjs": "rxjs",
     "rxjs/operators": "rxjs.operators",

src/components-examples/material/datepicker/datepicker-locale/datepicker-locale-example.ts

@@ -5,6 +5,8 @@ import {
   MAT_MOMENT_DATE_ADAPTER_OPTIONS,
 } from '@angular/material-moment-adapter';
 import {DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE} from '@angular/material/core';
+import 'moment/locale/ja';
+import 'moment/locale/fr';
 
 /** @title Datepicker with different locale */
 @Component({