[Added Password text in .csv file]

Author: hitesh-wagento

app/code/Magento/Checkout/i18n/en_US.csv

@@ -176,5 +176,5 @@ Payment,Payment
 "Not yet calculated","Not yet calculated"
 "We received your order!","We received your order!"
 "Thank you for your purchase!","Thank you for your purchase!"
-"optional", "optional"
+"Password", "Password"
 "Something went wrong while saving the page. Please refresh the page and try again.","Something went wrong while saving the page. Please refresh the page and try again."