Rename Swaziland to Eswatini

The country of Swaziland was officially renamed to Eswatini in April 2018. Let
us reflect this change.

plugins/woocommerce/i18n/countries.php

@@ -225,7 +225,7 @@ return array(
 	'SD' => __( 'Sudan', 'woocommerce' ),
 	'SR' => __( 'Suriname', 'woocommerce' ),
 	'SJ' => __( 'Svalbard and Jan Mayen', 'woocommerce' ),
-	'SZ' => __( 'Swaziland', 'woocommerce' ),
+	'SZ' => __( 'Eswatini', 'woocommerce' ),
 	'SE' => __( 'Sweden', 'woocommerce' ),
 	'CH' => __( 'Switzerland', 'woocommerce' ),
 	'SY' => __( 'Syria', 'woocommerce' ),

plugins/woocommerce/includes/class-wc-geo-ip.php

@@ -843,7 +843,7 @@ class WC_Geo_IP {
 		'Sao Tome and Principe',
 		'El Salvador',
 		'Syrian Arab Republic',
-		'Swaziland',
+		'Eswatini',
 		'Turks and Caicos Islands',
 		'Chad',
 		'French Southern Territories',