Update localization strings to include new group-related terms in English and Russian

Added translations for 'Group' and 'Pick a group' in both the English and Russian locale files, enhancing the user interface for group selection features.

frontend/src/shared/lib/locales/en.ts

@@ -548,6 +548,8 @@ export const en = {
       everyDay: 'every day',
       daypart: 'Daypart',
       slotKind: 'Slot type',
+      group: 'Group',
+      pickGroup: 'Pick a group',
       strategy: 'Strategy',
       cooldownDays: 'Cooldown, days',
       cooldownHint: 'Skip what already aired within this period.',

frontend/src/shared/lib/locales/ru.ts

@@ -543,6 +543,8 @@ export const ru = {
       everyDay: 'каждый день',
       daypart: 'Дейпарт',
       slotKind: 'Тип слота',
+      group: 'Группа',
+      pickGroup: 'Выберите группу',
       strategy: 'Стратегия',
       cooldownDays: 'Остывание, дней',
       cooldownHint: 'Не брать то, что уже выходило за этот срок.',