Source

File: wp-includes/widgets/class-wp-widget-media.php

public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
		$widget_opts = wp_parse_args(
			$widget_options,
			array(
				'description'                 => __( 'A media item.' ),
				'customize_selective_refresh' => true,
				'mime_type'                   => '',
			)
		);

		$control_opts = wp_parse_args( $control_options, array() );

		$l10n_defaults = array(
			'no_media_selected'          => __( 'No media selected' ),
			'add_media'                  => _x( 'Add Media', 'label for button in the media widget' ),
			'replace_media'              => _x( 'Replace Media', 'label for button in the media widget; should preferably not be longer than ~13 characters long' ),
			'edit_media'                 => _x( 'Edit Media', 'label for button in the media widget; should preferably not be longer than ~13 characters long' ),
			'add_to_widget'              => __( 'Add to Widget' ),
			'missing_attachment'         => sprintf(
				/* translators: %s: URL to media library. */
				__( 'We can&#8217;t find that file. Check your <a href="%s">media library</a> and make sure it wasn&#8217;t deleted.' ),
				esc_url( admin_url( 'upload.php' ) )
			),
			/* translators: %d: Widget count. */
			'media_library_state_multi'  => _n_noop( 'Media Widget (%d)', 'Media Widget (%d)' ),
			'media_library_state_single' => __( 'Media Widget' ),
			'unsupported_file_type'      => __( 'Looks like this isn&#8217;t the correct kind of file. Please link to an appropriate file instead.' ),
		);
		$this->l10n    = array_merge( $l10n_defaults, array_filter( $this->l10n ) );

		parent::__construct(
			$id_base,
			$name,
			$widget_opts,
			$control_opts
		);
	}