Add missing </em> tag. Props @lidialab. Fixes #81.

regenerate-thumbnails.php

@@ -250,7 +250,7 @@ public function admin_enqueues( $hook_suffix ) {
 					'thumbnailSizesDescription'                  => __( 'These are all of the thumbnail sizes that are currently registered:', 'regenerate-thumbnails' ),
 					'alternatives'                               => __( 'Alternatives', 'regenerate-thumbnails' ),
 					'alternativesText1'                          => __( 'If you have <a href="{url-cli}">command-line</a> access to your site\'s server, consider using <a href="{url-wpcli}">WP-CLI</a> instead of this tool. It has a built-in <a href="{url-wpcli-regenerate}">regenerate command</a> that works similarly to this tool but should be significantly faster since it has the advantage of being a command-line tool.', 'regenerate-thumbnails' ),
-					'alternativesText2'                          => __( 'Another alternative is to use the <a href="{url-photon}">Photon</a> functionality that comes with the <a href="{url-jetpack}">Jetpack</a> plugin. It generates thumbnails on-demand using WordPress.com\'s infrastructure. <em>Disclaimer: The author of this plugin, Regenerate Thumbnails, is an employee of the company behind WordPress.com and Jetpack but I would recommend it even if I wasn\'t.', 'regenerate-thumbnails' ),
+					'alternativesText2'                          => __( 'Another alternative is to use the <a href="{url-photon}">Photon</a> functionality that comes with the <a href="{url-jetpack}">Jetpack</a> plugin. It generates thumbnails on-demand using WordPress.com\'s infrastructure. <em>Disclaimer: The author of this plugin, Regenerate Thumbnails, is an employee of the company behind WordPress.com and Jetpack but I would recommend it even if I wasn\'t.</em>', 'regenerate-thumbnails' ),
 				),
 				'RegenerateSingle'   => array(
 					'regenerateThumbnails'                      => _x( 'Regenerate Thumbnails', 'action for a single image', 'regenerate-thumbnails' ),