[web] Add sales-related option in all of our contact forms (#18395)

- in /contact page
- in navbar -> Help
- in the plans page
- in the editor left menu

GitOrigin-RevId: e9cecafe7c16a23155fca083dbb680ad1f6fe407

services/web/frontend/extracted-translations.json

@@ -216,6 +216,7 @@
   "contact_sales": "",
   "contact_support_to_change_group_subscription": "",
   "contact_us": "",
+  "contacting_the_sales_team": "",
   "continue": "",
   "continue_github_merge": "",
   "continue_to": "",

services/web/locales/en.json

@@ -314,6 +314,7 @@
   "contact_support_to_change_group_subscription": "Please <0>contact support</0> if you wish to change your group subscription.",
   "contact_us": "Contact Us",
   "contact_us_lowercase": "Contact us",
+  "contacting_the_sales_team": "Contacting the Sales team",
   "continue": "Continue",
   "continue_github_merge": "I have manually merged. Continue",
   "continue_to": "Continue to __appName__",