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 retrieved using the PHP `timezone_identifiers_list()` function.

See: https://3v4l.org/ro1vY/rfc#vgit.master

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 drop down lists on PHP 5.6 - 8.1, while the corrected spelling - `Kyiv` - will be used when to find the localized name for the timezone drop down lists on PHP 8.2 and up.

Previous: Trac#52861 / [50555].

Author: jrfnl

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' );