Site Health: Use correct singular string for plugin and theme version tests.

Props edocev, Presskopp.
Merges [45336] to the 5.2 branch.
Fixes #47264.
Built from https://develop.svn.wordpress.org/branches/5.2@45337


git-svn-id: http://core.svn.wordpress.org/branches/5.2@45148 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-site-health.php

@@ -355,7 +355,7 @@ class WP_Site_Health {
 					sprintf(
 						/* translators: %d: The number of active plugins. */
 						_n(
-							'Your site has %d active plugin, and they are all up to date.',
+							'Your site has %d active plugin, and it is up to date.',
 							'Your site has %d active plugins, and they are all up to date.',
 							$plugins_active
 						),
@@ -511,7 +511,7 @@ class WP_Site_Health {
 					sprintf(
 						/* translators: %d: The number of themes. */
 						_n(
-							'Your site has %d installed theme, and they are all up to date.',
+							'Your site has %d installed theme, and it is up to date.',
 							'Your site has %d installed themes, and they are all up to date.',
 							$themes_total
 						),

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.2.1-alpha-45335';
+$wp_version = '5.2.1-alpha-45337';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.