feat(events): added "Add to Google Calendar" button; and clarify .ics download

apps/web/app/i18n/messages/ar.json

@@ -67,7 +67,8 @@
     "applyToJoin": "قدّم طلب الانضمام",
     "viewUpcomingSessions": "اطّلع على الجلسات القادمة",
     "submitYourUpdate": "شاركونا مستجداتكم",
-    "addToCalendar": "أضف إلى التقويم",
+    "addToGoogleCalendar": "أضف إلى تقويم Google",
+    "downloadIcsFile": "تنزيل ملف .ics",
     "tryAgain": "حاول مرة أخرى"
   },
   "filters": {

apps/web/app/i18n/messages/en.json

@@ -67,7 +67,8 @@
     "applyToJoin": "Apply to join",
     "viewUpcomingSessions": "View upcoming sessions",
     "submitYourUpdate": "Submit your update",
-    "addToCalendar": "Add to calendar",
+    "addToGoogleCalendar": "Add to Google Calendar",
+    "downloadIcsFile": "Download .ics file",
     "tryAgain": "Try again"
   },
   "filters": {