I18N: Use wp.i18n for translatable strings in wp-admin/js/updates.js.

This removes the usage of `wp_localize_script()` for passing translations to the script and instead adds the translatable strings in the script directly through the use of `wp.i18n` and its utilities.

Props swissspidy, ocean90.
See #20491.
Fixes #50235.
Built from https://develop.svn.wordpress.org/trunk@47884


git-svn-id: http://core.svn.wordpress.org/trunk@47658 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/theme.js

@@ -799,7 +799,7 @@ themes.view.Details = wp.Backbone.View.extend({
 				_this.model.set( { autoupdate: 'enable' === data.state } );
 				$( document ).off( 'wp-auto-update-setting-changed', callback );
 			}
-		}
+		};
 
 		// Triggered in updates.js
 		$( document ).on( 'wp-auto-update-setting-changed', callback );