General: update module headings. (#11422)

#### Changes proposed in this Pull Request:
Follow-up from #10611

#### Testing instructions:


* none

#### Proposed changelog entry for your changes:


* none

modules/module-headings.php

@@ -35,7 +35,7 @@ function jetpack_get_module_i18n( $key ) {
 
 			'contact-form' => array(
 				'name' => _x( 'Contact Form', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Insert a customizable contact form anywhere on your site.', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Add a customizable contact form to any post or page using the Jetpack Form Block.', 'Module Description', 'jetpack' ),
 				'recommended description' => _x( 'Adds a button to your post and page editors, allowing you to build simple forms to help visitors stay in touch.', 'Jumpstart Description', 'jetpack' ),
 			),
 
@@ -88,7 +88,7 @@ function jetpack_get_module_i18n( $key ) {
 
 			'lazy-images' => array(
 				'name' => _x( 'Lazy Images', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Lazy load images', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Speed up your site and create a smoother viewing experience by loading images as visitors scroll down the screen, instead of all at once.', 'Module Description', 'jetpack' ),
 				'recommended description' => _x( 'Lazy-loading images improve your site\'s speed and create a smoother viewing experience. Images will load as visitors scroll down the screen, instead of all at once.', 'Jumpstart Description', 'jetpack' ),
 			),
 
@@ -120,7 +120,7 @@ function jetpack_get_module_i18n( $key ) {
 
 			'monitor' => array(
 				'name' => _x( 'Monitor', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Receive immediate notifications if your site goes down, 24/7.', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Jetpack’s downtime monitoring will continuously watch your site, and alert you the moment that downtime is detected.', 'Module Description', 'jetpack' ),
 				'recommended description' => _x( 'Receive immediate notifications if your site goes down, 24/7.', 'Jumpstart Description', 'jetpack' ),
 			),
 
@@ -131,33 +131,28 @@ function jetpack_get_module_i18n( $key ) {
 
 			'photon-cdn' => array(
 				'name' => _x( 'Asset CDN', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Serve static assets from our servers', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Jetpack’s Site Accelerator loads your site faster by optimizing your images and serving your images and static files from our global network of servers.', 'Module Description', 'jetpack' ),
 			),
 
 			'photon' => array(
 				'name' => _x( 'Photon', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Serve images from our servers', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Mirrors and serves your images from our free and fast image CDN, improving your site’s performance with no additional load on your servers.', 'Module Description', 'jetpack' ),
 				'recommended description' => _x( 'Mirrors and serves your images from our free and fast image CDN, improving your site’s performance with no additional load on your servers.', 'Jumpstart Description', 'jetpack' ),
 			),
 
-			'plugin-search' => array(
-				'name' => _x( 'Plugin Search Hints', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Make suggestions when people search the plugin directory for things that Jetpack already does for them.', 'Module Description', 'jetpack' ),
-			),
-
 			'post-by-email' => array(
 				'name' => _x( 'Post by email', 'Module Name', 'jetpack' ),
 				'description' => _x( 'Publish posts by sending an email', 'Module Description', 'jetpack' ),
 			),
 
 			'protect' => array(
 				'name' => _x( 'Protect', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Block suspicious-looking sign in activity', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Protect yourself from brute force and distributed brute force attacks, which are the most common way for hackers to get into your site.', 'Module Description', 'jetpack' ),
 			),
 
 			'publicize' => array(
 				'name' => _x( 'Publicize', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Automated social marketing.', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Publicize makes it easy to share your site’s posts on several social media networks automatically when you publish a new post.', 'Module Description', 'jetpack' ),
 			),
 
 			'pwa' => array(
@@ -167,13 +162,13 @@ function jetpack_get_module_i18n( $key ) {
 
 			'related-posts' => array(
 				'name' => _x( 'Related posts', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Increase page views by showing related content to your visitors.', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Keep visitors engaged on your blog by highlighting relevant and new content at the bottom of each published post.', 'Module Description', 'jetpack' ),
 				'recommended description' => _x( 'Keep visitors engaged on your blog by highlighting relevant and new content at the bottom of each published post.', 'Jumpstart Description', 'jetpack' ),
 			),
 
 			'search' => array(
 				'name' => _x( 'Search', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Enhanced search, powered by Elasticsearch', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Enhanced search, powered by Elasticsearch, a powerful replacement for WordPress search.', 'Module Description', 'jetpack' ),
 			),
 
 			'seo-tools' => array(
@@ -183,7 +178,7 @@ function jetpack_get_module_i18n( $key ) {
 
 			'sharedaddy' => array(
 				'name' => _x( 'Sharing', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Allow visitors to share your content.', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Add Twitter, Facebook and Google+ buttons at the bottom of each post, making it easy for visitors to share your content.', 'Module Description', 'jetpack' ),
 				'recommended description' => _x( 'Twitter, Facebook and many other buttons at the bottom of each post, making it easy for visitors to share your content.', 'Jumpstart Description', 'jetpack' ),
 			),
 
@@ -227,7 +222,7 @@ function jetpack_get_module_i18n( $key ) {
 
 			'vaultpress' => array(
 				'name' => _x( 'Data Backups', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Off-site backups, security scans, and automatic fixes.', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Every bit and byte of your site is backed up safely - daily or in real-time - to an off-site location.', 'Module Description', 'jetpack' ),
 			),
 
 			'verification-tools' => array(
@@ -237,7 +232,7 @@ function jetpack_get_module_i18n( $key ) {
 
 			'videopress' => array(
 				'name' => _x( 'VideoPress', 'Module Name', 'jetpack' ),
-				'description' => _x( 'Fast, ad-free video hosting', 'Module Description', 'jetpack' ),
+				'description' => _x( 'Save on hosting storage and bandwidth costs by streaming fast, ad-free video from our global network.', 'Module Description', 'jetpack' ),
 			),
 
 			'widget-visibility' => array(