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You can use the filter rtmedia_gallery_title in your theme and can modify the default media gallery title "Media Gallery" under media tab.

Add the following code in your theme's functions.php file:

    function change_media_gallery_title( $title ){
        $title = 'New Media Label';
        return $title;
    add_filter('rtmedia_gallery_title', 'change_media_gallery_title', 10, 1);

Where "New Media Label" will be name which you want to use.