Index: src/wp-includes/media.php
===================================================================
--- src/wp-includes/media.php	(revision 33814)
+++ src/wp-includes/media.php	(working copy)
@@ -3022,8 +3022,6 @@
 		}
 	}
 
-	$hier = $post && is_post_type_hierarchical( $post->post_type );
-
 	if ( $post ) {
 		$post_type_object = get_post_type_object( $post->post_type );
 	} else {
@@ -3062,10 +3060,10 @@
 		'allMediaItems'          => __( 'All media items' ),
 		'allDates'               => __( 'All dates' ),
 		'noItemsFound'           => __( 'No items found.' ),
-		'insertIntoPost'         => $hier ? __( 'Insert into page' ) : __( 'Insert into post' ),
+		'insertIntoPost'         => $post_type_object->labels->insert_into_item,
 		'unattached'             => __( 'Unattached' ),
 		'trash'                  => _x( 'Trash', 'noun' ),
-		'uploadedToThisPost'     => $hier ? __( 'Uploaded to this page' ) : __( 'Uploaded to this post' ),
+		'uploadedToThisPost'     => $post_type_object->labels->uploaded_to_this_item,
 		'warnDelete'             => __( "You are about to permanently delete this item.\n  'Cancel' to stop, 'OK' to delete." ),
 		'warnBulkDelete'         => __( "You are about to permanently delete these items.\n  'Cancel' to stop, 'OK' to delete." ),
 		'warnBulkTrash'          => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
Index: src/wp-includes/post-functions.php
===================================================================
--- src/wp-includes/post-functions.php	(revision 33814)
+++ src/wp-includes/post-functions.php	(working copy)
@@ -1326,6 +1326,8 @@
 		'not_found_in_trash' => array( __('No posts found in Trash.'), __('No pages found in Trash.') ),
 		'parent_item_colon' => array( null, __('Parent Page:') ),
 		'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) ),
+		'insert_into_item' => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
+		'uploaded_to_this_item' => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
 		'featured_image' => array( __( 'Featured Image' ), __( 'Featured Image' ) ),
 		'set_featured_image' => array( __( 'Set featured image' ), __( 'Set featured image' ) ),
 		'remove_featured_image' => array( __( 'Remove featured image' ), __( 'Remove featured image' ) ),