feat(web): indicate session activity in date picker (#1103)

* feat(web): indicate session activity in date picker

* fix(web): expose session activity to assistive tech

web/src/lib/locales/en.ts

@@ -60,6 +60,7 @@ export default {
   'sessions.timeFilter.close': 'Close date picker',
   'sessions.timeFilter.previousMonth': 'Previous month',
   'sessions.timeFilter.nextMonth': 'Next month',
+  'sessions.timeFilter.dayWithActivity': '{date}, has session activity',
   'sessions.group.showMore': 'Show {n} more',
   'sessions.group.showLess': 'Show less',
   'sessions.group.new': 'New session in this directory',

web/src/lib/locales/zh-CN.ts

@@ -60,6 +60,7 @@ export default {
   'sessions.timeFilter.close': '关闭日期选择器',
   'sessions.timeFilter.previousMonth': '上个月',
   'sessions.timeFilter.nextMonth': '下个月',
+  'sessions.timeFilter.dayWithActivity': '{date}，有会话活动',
   'sessions.group.showMore': '再显示 {n} 个',
   'sessions.group.showLess': '收起',
   'sessions.group.new': '在此目录新建会话',