[Payments] Add validation for unsupported credit card types in editor.

components/payments_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
 
   <message name="IDS_PAYMENTS_NAME_FIELD_IN_CONTACT_DETAILS" desc="The label for text input field containing the full name of a person. [CHAR-LIMIT=32]" formatter_data="android_java">
     Name
   </message>
   <message name="IDS_PAYMENTS_SAVE_CARD_TO_DEVICE_CHECKBOX" desc="The label for the checkbox that enables the user to save a credit card to their device, for example, on their phone." formatter_data="android_java">
     Save this card to this device
   </message>
   <message name="IDS_PAYMENTS_ACCEPTED_CARDS_LABEL" desc="The title for the section that displays the credit card types that the merchant accepts." formatter_data="android_java">
@@ skipping 87 matching lines @@
   </message>
   <message name="IDS_PAYMENTS_VALIDATION_INVALID_CREDIT_CARD_EXPIRATION_YEAR" desc="Message displayed to user when the credit card expiration year is in an invalid format.">
     Invalid expiration year
   </message>
   <message name="IDS_PAYMENTS_VALIDATION_INVALID_CREDIT_CARD_EXPIRATION_MONTH" desc="Message displayed to user when the credit card expiration month is in an invalid format.">
     Invalid expiration month
   </message>
   <message name="IDS_PAYMENTS_VALIDATION_INVALID_CREDIT_CARD_EXPIRED" desc="Message displayed to user when the credit card is expired.">
     The card is expired
   </message>
+  <message name="IDS_PAYMENTS_VALIDATION_UNSUPPORTED_CREDIT_CARD_TYPE" desc="Message displayed to user when the credit card type (e.g visa, mastercard) is not supported for this transaction.">
+    Unsupported card type
+  </message>
   <message name="IDS_PAYMENTS_REQUIRED_FIELD_MESSAGE" desc="The text that informs the user that '*' character indicates an input field that is required. The '*' character should not be changed." formatter_data="android_java">
     * indicates required field
   </message>
   <message name="IDS_PAYMENTS_FIELD_REQUIRED_VALIDATION_MESSAGE" desc="The text that informs the user that an input field is required." formatter_data="android_java">
     Required field
   </message>
   <message name="IDS_PAYMENTS_PHONE_INVALID_VALIDATION_MESSAGE" desc="The text that informs the user that the phone number they have entered is not valid." formatter_data="android_java">
     Invalid phone number
   </message>
   <message name="IDS_PAYMENTS_EMAIL_INVALID_VALIDATION_MESSAGE" desc="The text that informs the user that the email address they have entered is not valid." formatter_data="android_java">
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   <message name="IDS_PAYMENTS_UNSUPPORTED_PICKUP_ADDRESS" desc="Text implying that a user needs to choose a different pickup address, because the currently selected address is not supported. This address can be used, for example, for laundry pickup." formatter_data="android_java">
     Unsupported pickup address. Select a different address.
   </message>
   <message name="IDS_PAYMENTS_UNSUPPORTED_PICKUP_OPTION" desc="Text implying that a user needs to choose a different pickup option, because the currently selected option is not supported. This option can be used, for example, for laundry pickup." formatter_data="android_java">
     That pickup option isn’t available. Try a different option.
   </message>
   <message name="IDS_PAYMENTS_ANDROID_APP_ERROR" desc="Error message that is shown when an Android payment application fails to start." formatter_data="android_java">
     Unable to launch payment app.
   </message>
 </grit-part>