Sign-up referral link: the site reuses add_referral_code and referral_code; the optional label is retired

Author: bitprecipice

keys/add_referral_code.yaml

@@ -3,6 +3,7 @@ source: "Add referral code"
 platforms:
   - android
   - apple
+  - site
 localizations:
   ar: "إضافة رمز الإحالة"
   cs: "Přidání doporučujícího kódu"

keys/referral_code.yaml

@@ -2,6 +2,7 @@ description: "Call to action"
 source: "Referral code"
 platforms:
   - android
+  - site
 localizations:
   ar: "رمز الإحالة"
   cs: "Doporující kód"

keys/site_app_referral_code_optional.yaml

@@ -2,6 +2,8 @@ description: "Sign-up dialog: label of the optional referral code field"
 source: "Referral code (optional)"
 platforms:
   - site
+deprecated:
+  - site
 localizations:
   ar: "رمز الإحالة (اختياري)"
   de: "Empfehlungscode (optional)"