fix (MatCalendar): add missin change detection for MatCalendarHeader

Author: Tobias Schweizer

src/lib/datepicker/calendar.ts

@@ -42,7 +42,14 @@ import {ComponentPortal, ComponentType, Portal} from '@angular/cdk/portal';
     changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class MatCalendarHeader {
-    constructor(@Host() public calendar: MatCalendar<any>) {}
+    constructor(@Host() public calendar: MatCalendar<any>,
+                private _intl: MatDatepickerIntl,
+                changeDetectorRef: ChangeDetectorRef) {
+
+      this._intlChanges = _intl.changes.subscribe(() => changeDetectorRef.markForCheck());
+    }
+
+    private _intlChanges: Subscription;
 }
 
 /**