MAGETWO-72305: USPS First-Class Mail Parcel method no longer displaying checkout

 - Renamed "First-Class Mail Parcel" to "First-Class Package Service - Retail" according to USPS API changes

Author: YevSent

app/code/Magento/Usps/Model/Carrier.php

@@ -643,7 +643,7 @@ public function getCode($type, $code = '')
             'method' => [
                 '0_FCLE' => __('First-Class Mail Large Envelope'),
                 '0_FCL' => __('First-Class Mail Letter'),
-                '0_FCP' => __('First-Class Mail Parcel'),
+                '0_FCP' => __('First-Class Package Service - Retail'),
                 '0_FCPC' => __('First-Class Mail Postcards'),
                 '1' => __('Priority Mail'),
                 '2' => __('Priority Mail Express Hold For Pickup'),
@@ -795,7 +795,7 @@ public function getCode($type, $code = '')
             'method_to_code' => [
                 'First-Class Mail Large Envelope' => '0_FCLE',
                 'First-Class Mail Letter' => '0_FCL',
-                'First-Class Mail Parcel' => '0_FCP',
+                'First-Class Package Service - Retail' => '0_FCP',
             ],
             'first_class_mail_type' => ['LETTER' => __('Letter'), 'FLAT' => __('Flat'), 'PARCEL' => __('Parcel')],
             'container' => [

app/code/Magento/Usps/Setup/InstallData.php

@@ -39,6 +39,7 @@ public function install(ModuleDataSetupInterface $setup, ModuleContextInterface
             'First-Class Mail Letter' => '0_FCL',
             'First-Class Mail Parcel' => '0_FCP',
             'First-Class Mail Package' => '0_FCP',
+            'First-Class Package Service - Retail' => '0_FCP',
             'Parcel Post' => '4',
             'Retail Ground' => '4',
             'Media Mail' => '6',

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

@@ -1,6 +1,6 @@
 "First-Class Mail Large Envelope","First-Class Mail Large Envelope"
 "First-Class Mail Letter","First-Class Mail Letter"
-"First-Class Mail Parcel","First-Class Mail Parcel"
+"First-Class Package Service - Retail","First-Class Package Service - Retail"
 "First-Class Mail Postcards","First-Class Mail Postcards"
 "Priority Mail","Priority Mail"
 "Priority Mail Express Hold For Pickup","Priority Mail Express Hold For Pickup"