Index: src/wp-admin/comment.php
===================================================================
--- src/wp-admin/comment.php	(revision 48144)
+++ src/wp-admin/comment.php	(working copy)
@@ -125,19 +125,19 @@
 		switch ( $action ) {
 			case 'spam':
 				$caution_msg = __( 'You are about to mark the following comment as spam:' );
-				$button      = _x( 'Mark as Spam', 'comment' );
+				$button      = _x( 'Mark as spam', 'comment' );
 				break;
 			case 'trash':
 				$caution_msg = __( 'You are about to move the following comment to the Trash:' );
-				$button      = __( 'Move to Trash' );
+				$button      = __( 'Move to trash' );
 				break;
 			case 'delete':
 				$caution_msg = __( 'You are about to delete the following comment:' );
-				$button      = __( 'Permanently Delete Comment' );
+				$button      = __( 'Permanently delete comment' );
 				break;
 			default:
 				$caution_msg = __( 'You are about to approve the following comment:' );
-				$button      = __( 'Approve Comment' );
+				$button      = __( 'Approve comment' );
 				break;
 		}
 
@@ -179,7 +179,7 @@
 </tr>
 <?php } ?>
 <tr>
-	<th scope="row"><?php /* translators: Column name or table row header. */ _e( 'In Response To' ); ?></th>
+	<th scope="row"><?php /* translators: Column name or table row header. */ _e( 'In response to' ); ?></th>
 	<td>
 		<?php
 		$post_id = $comment->comment_post_ID;
Index: src/wp-admin/edit-comments.php
===================================================================
--- src/wp-admin/edit-comments.php	(revision 48144)
+++ src/wp-admin/edit-comments.php	(working copy)
@@ -172,7 +172,7 @@
 		'id'      => 'overview',
 		'title'   => __( 'Overview' ),
 		'content' =>
-				'<p>' . __( 'You can manage comments made on your site similar to the way you manage posts and other content. This screen is customizable in the same ways as other management screens, and you can act on comments using the on-hover action links or the Bulk Actions.' ) . '</p>',
+				'<p>' . __( 'You can manage comments made on your site similar to the way you manage posts and other content. This screen is customizable in the same ways as other management screens, and you can act on comments using the on-hover action links or the bulk actions.' ) . '</p>',
 	)
 );
 get_current_screen()->add_help_tab(
@@ -183,8 +183,8 @@
 					'<p>' . __( 'A red bar on the left means the comment is waiting for you to moderate it.' ) . '</p>' .
 					'<p>' . __( 'In the <strong>Author</strong> column, in addition to the author&#8217;s name, email address, and blog URL, the commenter&#8217;s IP address is shown. Clicking on this link will show you all the comments made from this IP address.' ) . '</p>' .
 					'<p>' . __( 'In the <strong>Comment</strong> column, hovering over any comment gives you options to approve, reply (and approve), quick edit, edit, spam mark, or trash that comment.' ) . '</p>' .
-					'<p>' . __( 'In the <strong>In Response To</strong> column, there are three elements. The text is the name of the post that inspired the comment, and links to the post editor for that entry. The View Post link leads to that post on your live site. The small bubble with the number in it shows the number of approved comments that post has received. If there are pending comments, a red notification circle with the number of pending comments is displayed. Clicking the notification circle will filter the comments screen to show only pending comments on that post.' ) . '</p>' .
-					'<p>' . __( 'In the <strong>Submitted On</strong> column, the date and time the comment was left on your site appears. Clicking on the date/time link will take you to that comment on your live site.' ) . '</p>' .
+					'<p>' . __( 'In the <strong>In response to</strong> column, there are three elements. The text is the name of the post that inspired the comment, and links to the post editor for that entry. The View Post link leads to that post on your live site. The small bubble with the number in it shows the number of approved comments that post has received. If there are pending comments, a red notification circle with the number of pending comments is displayed. Clicking the notification circle will filter the comments screen to show only pending comments on that post.' ) . '</p>' .
+					'<p>' . __( 'In the <strong>Submitted on</strong> column, the date and time the comment was left on your site appears. Clicking on the date/time link will take you to that comment on your live site.' ) . '</p>' .
 					'<p>' . __( 'Many people take advantage of keyboard shortcuts to moderate their comments more quickly. Use the link to the side to learn more.' ) . '</p>',
 	)
 );
Index: src/wp-admin/edit-form-comment.php
===================================================================
--- src/wp-admin/edit-form-comment.php	(revision 48144)
+++ src/wp-admin/edit-form-comment.php	(working copy)
@@ -202,7 +202,7 @@
 
 <div id="major-publishing-actions">
 <div id="delete-action">
-<?php echo "<a class='submitdelete deletion' href='" . wp_nonce_url( 'comment.php?action=' . ( ! EMPTY_TRASH_DAYS ? 'deletecomment' : 'trashcomment' ) . "&amp;c=$comment->comment_ID&amp;_wp_original_http_referer=" . urlencode( wp_get_referer() ), 'delete-comment_' . $comment->comment_ID ) . "'>" . ( ! EMPTY_TRASH_DAYS ? __( 'Delete Permanently' ) : __( 'Move to Trash' ) ) . "</a>\n"; ?>
+<?php echo "<a class='submitdelete deletion' href='" . wp_nonce_url( 'comment.php?action=' . ( ! EMPTY_TRASH_DAYS ? 'deletecomment' : 'trashcomment' ) . "&amp;c=$comment->comment_ID&amp;_wp_original_http_referer=" . urlencode( wp_get_referer() ), 'delete-comment_' . $comment->comment_ID ) . "'>" . ( ! EMPTY_TRASH_DAYS ? __( 'Delete Permanently' ) : __( 'Move to trash' ) ) . "</a>\n"; ?>
 </div>
 <div id="publishing-action">
 <?php submit_button( __( 'Update' ), 'primary large', 'save', false ); ?>
Index: src/wp-admin/edit.php
===================================================================
--- src/wp-admin/edit.php	(revision 48144)
+++ src/wp-admin/edit.php	(working copy)
@@ -264,9 +264,9 @@
 	get_current_screen()->add_help_tab(
 		array(
 			'id'      => 'bulk-actions',
-			'title'   => __( 'Bulk Actions' ),
+			'title'   => __( 'Bulk actions' ),
 			'content' =>
-					'<p>' . __( 'You can also edit or move multiple posts to the Trash at once. Select the posts you want to act on using the checkboxes, then select the action you want to take from the Bulk Actions menu and click Apply.' ) . '</p>' .
+					'<p>' . __( 'You can also edit or move multiple posts to the Trash at once. Select the posts you want to act on using the checkboxes, then select the action you want to take from the Bulk actions menu and click Apply.' ) . '</p>' .
 							'<p>' . __( 'When using Bulk Edit, you can change the metadata (categories, author, etc.) for all selected posts at once. To remove a post from the grouping, just click the x next to its name in the Bulk Edit area that appears.' ) . '</p>',
 		)
 	);
@@ -292,7 +292,7 @@
 			'title'   => __( 'Managing Pages' ),
 			'content' =>
 					'<p>' . __( 'Managing pages is very similar to managing posts, and the screens can be customized in the same way.' ) . '</p>' .
-					'<p>' . __( 'You can also perform the same types of actions, including narrowing the list by using the filters, acting on a page using the action links that appear when you hover over a row, or using the Bulk Actions menu to edit the metadata for multiple pages at once.' ) . '</p>',
+					'<p>' . __( 'You can also perform the same types of actions, including narrowing the list by using the filters, acting on a page using the action links that appear when you hover over a row, or using the Bulk actions menu to edit the metadata for multiple pages at once.' ) . '</p>',
 		)
 	);
 
Index: src/wp-admin/includes/class-wp-comments-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-comments-list-table.php	(revision 48144)
+++ src/wp-admin/includes/class-wp-comments-list-table.php	(working copy)
@@ -351,19 +351,19 @@
 			$actions['approve'] = __( 'Approve' );
 		}
 		if ( in_array( $comment_status, array( 'all', 'moderated', 'approved', 'trash' ), true ) ) {
-			$actions['spam'] = _x( 'Mark as Spam', 'comment' );
+			$actions['spam'] = _x( 'Mark as spam', 'comment' );
 		}
 
 		if ( 'trash' === $comment_status ) {
 			$actions['untrash'] = __( 'Restore' );
 		} elseif ( 'spam' === $comment_status ) {
-			$actions['unspam'] = _x( 'Not Spam', 'comment' );
+			$actions['unspam'] = _x( 'Not spam', 'comment' );
 		}
 
 		if ( in_array( $comment_status, array( 'trash', 'spam' ), true ) || ! EMPTY_TRASH_DAYS ) {
-			$actions['delete'] = __( 'Delete Permanently' );
+			$actions['delete'] = __( 'Delete permanently' );
 		} else {
-			$actions['trash'] = __( 'Move to Trash' );
+			$actions['trash'] = __( 'Move to trash' );
 		}
 
 		return $actions;
@@ -467,10 +467,10 @@
 
 		if ( ! $post_id ) {
 			/* translators: Column name or table row header. */
-			$columns['response'] = __( 'In Response To' );
+			$columns['response'] = __( 'In response to' );
 		}
 
-		$columns['date'] = _x( 'Submitted On', 'column name' );
+		$columns['date'] = _x( 'Submitted on', 'column name' );
 
 		return $columns;
 	}
Index: src/wp-admin/includes/class-wp-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-list-table.php	(revision 48144)
+++ src/wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -440,7 +440,7 @@
 		if ( is_null( $this->_actions ) ) {
 			$this->_actions = $this->get_bulk_actions();
 			/**
-			 * Filters the list table Bulk Actions drop-down.
+			 * Filters the list table bulk actions drop-down.
 			 *
 			 * The dynamic portion of the hook name, `$this->screen->id`, refers
 			 * to the ID of the current screen, usually a string.
@@ -463,7 +463,7 @@
 
 		echo '<label for="bulk-action-selector-' . esc_attr( $which ) . '" class="screen-reader-text">' . __( 'Select bulk action' ) . '</label>';
 		echo '<select name="action' . $two . '" id="bulk-action-selector-' . esc_attr( $which ) . "\">\n";
-		echo '<option value="-1">' . __( 'Bulk Actions' ) . "</option>\n";
+		echo '<option value="-1">' . __( 'Bulk actions' ) . "</option>\n";
 
 		foreach ( $this->_actions as $name => $title ) {
 			$class = 'edit' === $name ? ' class="hide-if-no-js"' : '';
Index: src/wp-admin/includes/class-wp-media-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-media-list-table.php	(revision 48144)
+++ src/wp-admin/includes/class-wp-media-list-table.php	(working copy)
@@ -149,12 +149,12 @@
 		if ( MEDIA_TRASH ) {
 			if ( $this->is_trash ) {
 				$actions['untrash'] = __( 'Restore' );
-				$actions['delete']  = __( 'Delete Permanently' );
+				$actions['delete']  = __( 'Delete permanently' );
 			} else {
-				$actions['trash'] = __( 'Move to Trash' );
+				$actions['trash'] = __( 'Move to trash' );
 			}
 		} else {
-			$actions['delete'] = __( 'Delete Permanently' );
+			$actions['delete'] = __( 'Delete permanently' );
 		}
 
 		if ( $this->detached ) {
Index: src/wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-posts-list-table.php	(revision 48144)
+++ src/wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -415,9 +415,9 @@
 
 		if ( current_user_can( $post_type_obj->cap->delete_posts ) ) {
 			if ( $this->is_trash || ! EMPTY_TRASH_DAYS ) {
-				$actions['delete'] = __( 'Delete Permanently' );
+				$actions['delete'] = __( 'Delete permanently' );
 			} else {
-				$actions['trash'] = __( 'Move to Trash' );
+				$actions['trash'] = __( 'Move to trash' );
 			}
 		}
 
Index: src/wp-admin/includes/meta-boxes.php
===================================================================
--- src/wp-admin/includes/meta-boxes.php	(revision 48144)
+++ src/wp-admin/includes/meta-boxes.php	(working copy)
@@ -332,9 +332,9 @@
 		<?php
 		if ( current_user_can( 'delete_post', $post_id ) ) {
 			if ( ! EMPTY_TRASH_DAYS ) {
-				$delete_text = __( 'Delete Permanently' );
+				$delete_text = __( 'Delete permanently' );
 			} else {
-				$delete_text = __( 'Move to Trash' );
+				$delete_text = __( 'Move to trash' );
 			}
 			?>
 			<a class="submitdelete deletion" href="<?php echo get_delete_post_link( $post_id ); ?>"><?php echo $delete_text; ?></a>
@@ -438,10 +438,10 @@
 	<?php
 	if ( current_user_can( 'delete_post', $post->ID ) ) {
 		if ( EMPTY_TRASH_DAYS && MEDIA_TRASH ) {
-			echo "<a class='submitdelete deletion' href='" . get_delete_post_link( $post->ID ) . "'>" . __( 'Move to Trash' ) . '</a>';
+			echo "<a class='submitdelete deletion' href='" . get_delete_post_link( $post->ID ) . "'>" . __( 'Move to trash' ) . '</a>';
 		} else {
 			$delete_ays = ! MEDIA_TRASH ? " onclick='return showNotice.warn();'" : '';
-			echo "<a class='submitdelete deletion'$delete_ays href='" . get_delete_post_link( $post->ID, null, true ) . "'>" . __( 'Delete Permanently' ) . '</a>';
+			echo "<a class='submitdelete deletion'$delete_ays href='" . get_delete_post_link( $post->ID, null, true ) . "'>" . __( 'Delete permanently' ) . '</a>';
 		}
 	}
 	?>
@@ -1115,7 +1115,7 @@
 	?>
 <div id="taxonomy-linkcategory" class="categorydiv">
 	<ul id="category-tabs" class="category-tabs">
-		<li class="tabs"><a href="#categories-all"><?php _e( 'All Categories' ); ?></a></li>
+		<li class="tabs"><a href="#categories-all"><?php _e( 'All categories' ); ?></a></li>
 		<li class="hide-if-no-js"><a href="#categories-pop"><?php _ex( 'Most Used', 'categories' ); ?></a></li>
 	</ul>
 
Index: src/wp-admin/users.php
===================================================================
--- src/wp-admin/users.php	(revision 48144)
+++ src/wp-admin/users.php	(working copy)
@@ -53,9 +53,9 @@
 	'<li>' . __( '<strong>Edit</strong> takes you to the editable profile screen for that user. You can also reach that screen by clicking on the username.' ) . '</li>';
 
 if ( is_multisite() ) {
-	$help .= '<li>' . __( '<strong>Remove</strong> allows you to remove a user from your site. It does not delete their content. You can also remove multiple users at once by using Bulk Actions.' ) . '</li>';
+	$help .= '<li>' . __( '<strong>Remove</strong> allows you to remove a user from your site. It does not delete their content. You can also remove multiple users at once by using bulk actions.' ) . '</li>';
 } else {
-	$help .= '<li>' . __( '<strong>Delete</strong> brings you to the Delete Users screen for confirmation, where you can permanently remove a user from your site and delete their content. You can also delete multiple users at once by using Bulk Actions.' ) . '</li>';
+	$help .= '<li>' . __( '<strong>Delete</strong> brings you to the Delete Users screen for confirmation, where you can permanently remove a user from your site and delete their content. You can also delete multiple users at once by using bulk actions.' ) . '</li>';
 }
 
 $help .= '</ul>';
Index: src/wp-includes/media-template.php
===================================================================
--- src/wp-includes/media-template.php	(revision 48144)
+++ src/wp-includes/media-template.php	(working copy)
@@ -514,12 +514,12 @@
 				<# if ( ! data.uploading && data.can.remove ) { #> |
 					<?php if ( MEDIA_TRASH ) : ?>
 						<# if ( 'trash' === data.status ) { #>
-							<button type="button" class="button-link untrash-attachment"><?php _e( 'Restore from Trash' ); ?></button>
+							<button type="button" class="button-link untrash-attachment"><?php _e( 'Restore from trash' ); ?></button>
 						<# } else { #>
-							<button type="button" class="button-link trash-attachment"><?php _e( 'Move to Trash' ); ?></button>
+							<button type="button" class="button-link trash-attachment"><?php _e( 'Move to trash' ); ?></button>
 						<# } #>
 					<?php else : ?>
-						<button type="button" class="button-link delete-attachment"><?php _e( 'Delete Permanently' ); ?></button>
+						<button type="button" class="button-link delete-attachment"><?php _e( 'Delete permanently' ); ?></button>
 					<?php endif; ?>
 				<# } #>
 			</div>
@@ -635,12 +635,12 @@
 				<# if ( ! data.uploading && data.can.remove ) { #>
 					<?php if ( MEDIA_TRASH ) : ?>
 					<# if ( 'trash' === data.status ) { #>
-						<button type="button" class="button-link untrash-attachment"><?php _e( 'Restore from Trash' ); ?></button>
+						<button type="button" class="button-link untrash-attachment"><?php _e( 'Restore from trash' ); ?></button>
 					<# } else { #>
-						<button type="button" class="button-link trash-attachment"><?php _e( 'Move to Trash' ); ?></button>
+						<button type="button" class="button-link trash-attachment"><?php _e( 'Move to trash' ); ?></button>
 					<# } #>
 					<?php else : ?>
-						<button type="button" class="button-link delete-attachment"><?php _e( 'Delete Permanently' ); ?></button>
+						<button type="button" class="button-link delete-attachment"><?php _e( 'Delete permanently' ); ?></button>
 					<?php endif; ?>
 				<# } #>
 
Index: src/wp-includes/media.php
===================================================================
--- src/wp-includes/media.php	(revision 48144)
+++ src/wp-includes/media.php	(working copy)
@@ -4022,7 +4022,7 @@
 		// Generic.
 		'mediaFrameDefaultTitle'      => __( 'Media' ),
 		'url'                         => __( 'URL' ),
-		'addMedia'                    => __( 'Add Media' ),
+		'addMedia'                    => __( 'Add media' ),
 		'search'                      => __( 'Search' ),
 		'select'                      => __( 'Select' ),
 		'cancel'                      => __( 'Cancel' ),
@@ -4039,12 +4039,12 @@
 		'dragInfo'                    => __( 'Drag and drop to reorder media files.' ),
 
 		// Upload.
-		'uploadFilesTitle'            => __( 'Upload Files' ),
-		'uploadImagesTitle'           => __( 'Upload Images' ),
+		'uploadFilesTitle'            => __( 'Upload files' ),
+		'uploadImagesTitle'           => __( 'Upload images' ),
 
 		// Library.
 		'mediaLibraryTitle'           => __( 'Media Library' ),
-		'insertMediaTitle'            => __( 'Add Media' ),
+		'insertMediaTitle'            => __( 'Add media' ),
 		'createNewGallery'            => __( 'Create a new gallery' ),
 		'createNewPlaylist'           => __( 'Create a new playlist' ),
 		'createNewVideoPlaylist'      => __( 'Create a new video playlist' ),
@@ -4060,15 +4060,15 @@
 		'warnDelete'                  => __( "You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
 		'warnBulkDelete'              => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
 		'warnBulkTrash'               => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
-		'bulkSelect'                  => __( 'Bulk Select' ),
-		'trashSelected'               => __( 'Move to Trash' ),
-		'restoreSelected'             => __( 'Restore from Trash' ),
-		'deletePermanently'           => __( 'Delete Permanently' ),
+		'bulkSelect'                  => __( 'Bulk select' ),
+		'trashSelected'               => __( 'Move to trash' ),
+		'restoreSelected'             => __( 'Restore from trash' ),
+		'deletePermanently'           => __( 'Delete permanently' ),
 		'apply'                       => __( 'Apply' ),
 		'filterByDate'                => __( 'Filter by date' ),
 		'filterByType'                => __( 'Filter by type' ),
 		'searchLabel'                 => __( 'Search' ),
-		'searchMediaLabel'            => __( 'Search Media' ),          // Backward compatibility pre-5.3.
+		'searchMediaLabel'            => __( 'Search media' ),          // Backward compatibility pre-5.3.
 		'searchMediaPlaceholder'      => __( 'Search media items...' ), // Placeholder (no ellipsis), backward compatibility pre-5.3.
 		'mediaFound'                  => __( 'Number of media items found: %d' ),
 		'mediaFoundHasMoreResults'    => __( 'Number of media items displayed: %d. Scroll the page for more results.' ),
@@ -4076,7 +4076,7 @@
 		'noMediaTryNewSearch'         => __( 'No media items found. Try a different search.' ),
 
 		// Library Details.
-		'attachmentDetails'           => __( 'Attachment Details' ),
+		'attachmentDetails'           => __( 'Attachment details' ),
 
 		// From URL.
 		'insertFromUrlTitle'          => __( 'Insert from URL' ),
@@ -4086,26 +4086,26 @@
 		'setFeaturedImage'            => $post_type_object->labels->set_featured_image,
 
 		// Gallery.
-		'createGalleryTitle'          => __( 'Create Gallery' ),
-		'editGalleryTitle'            => __( 'Edit Gallery' ),
-		'cancelGalleryTitle'          => __( '&#8592; Cancel Gallery' ),
+		'createGalleryTitle'          => __( 'Create gallery' ),
+		'editGalleryTitle'            => __( 'Edit gallery' ),
+		'cancelGalleryTitle'          => __( '&#8592; Cancel gallery' ),
 		'insertGallery'               => __( 'Insert gallery' ),
 		'updateGallery'               => __( 'Update gallery' ),
 		'addToGallery'                => __( 'Add to gallery' ),
-		'addToGalleryTitle'           => __( 'Add to Gallery' ),
+		'addToGalleryTitle'           => __( 'Add to gallery' ),
 		'reverseOrder'                => __( 'Reverse order' ),
 
 		// Edit Image.
-		'imageDetailsTitle'           => __( 'Image Details' ),
-		'imageReplaceTitle'           => __( 'Replace Image' ),
-		'imageDetailsCancel'          => __( 'Cancel Edit' ),
-		'editImage'                   => __( 'Edit Image' ),
+		'imageDetailsTitle'           => __( 'Image details' ),
+		'imageReplaceTitle'           => __( 'Replace image' ),
+		'imageDetailsCancel'          => __( 'Cancel edit' ),
+		'editImage'                   => __( 'Edit image' ),
 
 		// Crop Image.
-		'chooseImage'                 => __( 'Choose Image' ),
-		'selectAndCrop'               => __( 'Select and Crop' ),
-		'skipCropping'                => __( 'Skip Cropping' ),
-		'cropImage'                   => __( 'Crop Image' ),
+		'chooseImage'                 => __( 'Choose image' ),
+		'selectAndCrop'               => __( 'Select and crop' ),
+		'skipCropping'                => __( 'Skip cropping' ),
+		'cropImage'                   => __( 'Crop image' ),
 		'cropYourImage'               => __( 'Crop your image' ),
 		'cropping'                    => __( 'Cropping&hellip;' ),
 		/* translators: 1: Suggested width number, 2: Suggested height number. */
@@ -4113,24 +4113,24 @@
 		'cropError'                   => __( 'There has been an error cropping your image.' ),
 
 		// Edit Audio.
-		'audioDetailsTitle'           => __( 'Audio Details' ),
-		'audioReplaceTitle'           => __( 'Replace Audio' ),
-		'audioAddSourceTitle'         => __( 'Add Audio Source' ),
-		'audioDetailsCancel'          => __( 'Cancel Edit' ),
+		'audioDetailsTitle'           => __( 'Audio details' ),
+		'audioReplaceTitle'           => __( 'Replace audio' ),
+		'audioAddSourceTitle'         => __( 'Add audio source' ),
+		'audioDetailsCancel'          => __( 'Cancel edit' ),
 
 		// Edit Video.
-		'videoDetailsTitle'           => __( 'Video Details' ),
-		'videoReplaceTitle'           => __( 'Replace Video' ),
-		'videoAddSourceTitle'         => __( 'Add Video Source' ),
-		'videoDetailsCancel'          => __( 'Cancel Edit' ),
-		'videoSelectPosterImageTitle' => __( 'Select Poster Image' ),
-		'videoAddTrackTitle'          => __( 'Add Subtitles' ),
+		'videoDetailsTitle'           => __( 'Video details' ),
+		'videoReplaceTitle'           => __( 'Replace video' ),
+		'videoAddSourceTitle'         => __( 'Add video source' ),
+		'videoDetailsCancel'          => __( 'Cancel edit' ),
+		'videoSelectPosterImageTitle' => __( 'Select poster image' ),
+		'videoAddTrackTitle'          => __( 'Add subtitles' ),
 
 		// Playlist.
 		'playlistDragInfo'            => __( 'Drag and drop to reorder tracks.' ),
-		'createPlaylistTitle'         => __( 'Create Audio Playlist' ),
-		'editPlaylistTitle'           => __( 'Edit Audio Playlist' ),
-		'cancelPlaylistTitle'         => __( '&#8592; Cancel Audio Playlist' ),
+		'createPlaylistTitle'         => __( 'Create audio playlist' ),
+		'editPlaylistTitle'           => __( 'Edit audio playlist' ),
+		'cancelPlaylistTitle'         => __( '&#8592; Cancel audio playlist' ),
 		'insertPlaylist'              => __( 'Insert audio playlist' ),
 		'updatePlaylist'              => __( 'Update audio playlist' ),
 		'addToPlaylist'               => __( 'Add to audio playlist' ),
@@ -4138,16 +4138,16 @@
 
 		// Video Playlist.
 		'videoPlaylistDragInfo'       => __( 'Drag and drop to reorder videos.' ),
-		'createVideoPlaylistTitle'    => __( 'Create Video Playlist' ),
-		'editVideoPlaylistTitle'      => __( 'Edit Video Playlist' ),
-		'cancelVideoPlaylistTitle'    => __( '&#8592; Cancel Video Playlist' ),
+		'createVideoPlaylistTitle'    => __( 'Create video playlist' ),
+		'editVideoPlaylistTitle'      => __( 'Edit video playlist' ),
+		'cancelVideoPlaylistTitle'    => __( '&#8592; Cancel video playlist' ),
 		'insertVideoPlaylist'         => __( 'Insert video playlist' ),
 		'updateVideoPlaylist'         => __( 'Update video playlist' ),
 		'addToVideoPlaylist'          => __( 'Add to video playlist' ),
-		'addToVideoPlaylistTitle'     => __( 'Add to Video Playlist' ),
+		'addToVideoPlaylistTitle'     => __( 'Add to video Playlist' ),
 
 		// Headings.
-		'filterAttachments'           => __( 'Filter Media' ),
+		'filterAttachments'           => __( 'Filter media' ),
 		'attachmentsList'             => __( 'Media list' ),
 	);
 
Index: src/wp-includes/taxonomy.php
===================================================================
--- src/wp-includes/taxonomy.php	(revision 48144)
+++ src/wp-includes/taxonomy.php	(working copy)
@@ -510,7 +510,7 @@
  *     @type string $search_items               Default 'Search Tags'/'Search Categories'.
  *     @type string $popular_items              This label is only used for non-hierarchical taxonomies.
  *                                              Default 'Popular Tags'.
- *     @type string $all_items                  Default 'All Tags'/'All Categories'.
+ *     @type string $all_items                  Default 'All tags'/'All categories'.
  *     @type string $parent_item                This label is only used for hierarchical taxonomies. Default
  *                                              'Parent Category'.
  *     @type string $parent_item_colon          The same as `parent_item`, but with colon `:` in the end.
@@ -552,7 +552,7 @@
 		'singular_name'              => array( _x( 'Tag', 'taxonomy singular name' ), _x( 'Category', 'taxonomy singular name' ) ),
 		'search_items'               => array( __( 'Search Tags' ), __( 'Search Categories' ) ),
 		'popular_items'              => array( __( 'Popular Tags' ), null ),
-		'all_items'                  => array( __( 'All Tags' ), __( 'All Categories' ) ),
+		'all_items'                  => array( __( 'All tags' ), __( 'All categories' ) ),
 		'parent_item'                => array( null, __( 'Parent Category' ) ),
 		'parent_item_colon'          => array( null, __( 'Parent Category:' ) ),
 		'edit_item'                  => array( __( 'Edit Tag' ), __( 'Edit Category' ) ),