Fix AI assist links based on annual/monthly switch (#25052)

* Fix AI assist links based on annual/monthly switch

* use translations for annually discount

GitOrigin-RevId: eaf10720eb162c8ecbd891e8f73475db0c02b9f9

services/web/frontend/extracted-translations.json

@@ -1191,6 +1191,7 @@
   "pending_invite": "",
   "per_license": "",
   "per_month": "",
+  "per_month_billed_annually": "",
   "percent_is_the_percentage_of_the_line_width": "",
   "permanently_disables_the_preview": "",
   "personal_library": "",