WordPress labels

Where do wordpress store labels for “<?php echo esc_html( $post_type_object->labels->name ); ?>” which can be found in the edit.php file in wp-admin folder?

The lable “<?php echo esc_html( $post_type_object->labels->name ); ?>” translates into the word “Posts”. I just want to locate the file where they are all store so I can make changes.