Add warning messaging for ramps scenes for fiat/country mismatch

Also fix grammar in sell string `trade_sell_unavailable_body_1_2s`

Author: Jon-edge

CHANGELOG.md

@@ -14,6 +14,7 @@
 - changed: `SwapCreateScene` shows a "Cancel" and "Next" button when editing
   amounts
 - changed: Enable Paybis sell for US debit/credit card
+- changed: Add warning messaging in ramps scenes for fiat/country mismatch
 
 ## 4.39.3 (2025-11-28)