Echo short code syntax

the error is saying to change ; to . – you will also want to remove the extra .:

<?php echo do_shortcode("[svg-flag flag=\""  . get_post_meta($post->ID, 'ozellikler_text', true) . "\"]"); ?>

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)