Changed the title and description of the thumbnail item

src/classes/repositories/class-tainacan-collections.php

@@ -182,8 +182,8 @@ class Collections extends Repository {
 			],
 			'_thumbnail_id'          => [
 				'map'         => 'meta',
-				'title'       => __( 'Featured image ID', 'tainacan' ),
-				'description' => __( 'Featured image ID', 'tainacan' )
+				'title'       => __( 'Thumbnail', 'tainacan' ),
+				'description' => __( 'Squared reduced-size version of a picture that helps recognizing and organizing files', 'tainacan' )
 			]
 
 		] );