I18N: Update list of continents and cities for the timezone selection.

Based on a two-way comparison between the available timezone city names in PHP 5.6.20 and PHP 8.2.0.

Lists of available timezone names have been retrieved using the PHP `timezone_identifiers_list()` function.

See: [https://3v4l.org/ro1vY/rfc#vgit.master timezone_identifiers_list() output and comparison].

Note: Both spellings of `Kiev`/`Kyiv` need to be in the list to allow it to work PHP cross-version.
* The “old” version — `Kiev` — will be used as the basis to find the localized name for the timezone dropdown lists on PHP 5.6 to 8.1.
* The corrected spelling — `Kyiv` — will be used to find the localized name on PHP 8.2 and up.

Follow-up to [50555], [54207], [54217].

Props jrf, costdev.
See #56468.

git-svn-id: https://develop.svn.wordpress.org/trunk@54227 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/includes/continents-cities.php

@@ -448,6 +448,7 @@
 __( 'Jersey', 'continents-cities' );
 __( 'Kaliningrad', 'continents-cities' );
 __( 'Kiev', 'continents-cities' );
+__( 'Kyiv', 'continents-cities' );
 __( 'Kirov', 'continents-cities' );
 __( 'Lisbon', 'continents-cities' );
 __( 'Ljubljana', 'continents-cities' );
@@ -519,6 +520,7 @@
 __( 'Guam', 'continents-cities' );
 __( 'Honolulu', 'continents-cities' );
 __( 'Johnston', 'continents-cities' );
+__( 'Kanton', 'continents-cities' );
 __( 'Kiritimati', 'continents-cities' );
 __( 'Kosrae', 'continents-cities' );
 __( 'Kwajalein', 'continents-cities' );