chore(*): update failing tests

Author: nrobakova

projects/igniteui-angular/src/lib/grids/grid/grid-filtering-ui.spec.ts

@@ -1249,14 +1249,15 @@ describe('IgxGrid - Filtering actions', () => {
         fix.detectChanges();
 
         const firstMonth = calendar.querySelector('.igx-calendar__month');
+        const firstMonthText = (firstMonth as HTMLElement).innerText;
         firstMonth.dispatchEvent(new Event('click'));
         tick();
         fix.detectChanges();
 
         calendar = outlet.getElementsByClassName('igx-calendar')[0];
         const month = calendar.querySelector('.igx-calendar-picker__date');
 
-        expect(month.innerHTML.trim()).toEqual('Jan');
+        expect(month.innerHTML.trim()).toEqual(firstMonthText);
     }));
 
     it('Should correctly select year from year view datepicker/calendar component', fakeAsync(() => {