fix: update current duty display text for improved clarity

- Changed the displayed text for current duty from "Текущее дежурство" to "Сейчас дежурит" to enhance user understanding.
- This update aligns with the recent efforts to unify language handling across the application.

webapp/js/currentDuty.test.js

@@ -110,7 +110,7 @@ describe("currentDuty", () => {
       };
       const html = renderCurrentDutyContent(duty, "ru");
       expect(html).toContain("current-duty-live-dot");
-      expect(html).toContain("Текущее дежурство");
+      expect(html).toContain("Сейчас дежурит");
       expect(html).toContain("Иванов Иван");
       expect(html).toContain("Смена");
       expect(html).toContain("current-duty-remaining");