refactor: simplify CalendarPage and CalendarHeader components by removing unused props

- Removed the handleGoToToday function and its associated prop from CalendarPage, streamlining the component's logic.
- Eliminated the isLoading and onRefresh props from CalendarHeader, enhancing clarity and reducing complexity.
- Updated internationalization messages to remove references to "Today" and "Refresh," aligning with the component changes.

webapp-next/src/components/CalendarPage.tsx

@@ -123,11 +123,6 @@ export function CalendarPage({ isAllowed, initDataRaw }: CalendarPageProps) {
     setSelectedDay(null);
   }, [setSelectedDay]);
 
-  const handleGoToToday = useCallback(() => {
-    setCurrentMonth(new Date());
-    retry();
-  }, [setCurrentMonth, retry]);
-
   const readyCalledRef = useRef(false);
   // Signal Telegram to hide loading when the first load finishes (loading goes true -> false).
   useEffect(() => {
@@ -145,10 +140,7 @@ export function CalendarPage({ isAllowed, initDataRaw }: CalendarPageProps) {
       >
         <CalendarHeader
           month={currentMonth}
-          isLoading={false}
           disabled={navDisabled}
-          onGoToToday={handleGoToToday}
-          onRefresh={retry}
           onPrevMonth={handlePrevMonth}
           onNextMonth={handleNextMonth}
         />