Networks and Sites: Replace two remaining occurrences of "blog" with "site" in user-facing strings.

Follow-up to [36386], [36416], [36417], [46213].

Props audrasjb.
Fixes #53775.
Built from https://develop.svn.wordpress.org/trunk@51500


git-svn-id: http://core.svn.wordpress.org/trunk@51111 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/site-new.php

@@ -56,7 +56,7 @@ if ( isset( $_REQUEST['action'] ) && 'add-site' === $_REQUEST['action'] ) {
 			wp_die(
 				sprintf(
 					/* translators: %s: Reserved names list. */
-					__( 'The following words are reserved for use by WordPress functions and cannot be used as blog names: %s' ),
+					__( 'The following words are reserved for use by WordPress functions and cannot be used as site names: %s' ),
 					'<code>' . implode( '</code>, <code>', $subdirectory_reserved_names ) . '</code>'
 				)
 			);