You can also try and modify it by yourself.
Go to wp-content/themes/elvyre/ folder and open functions.php. Go to about 1159 line where it is written:
echo '<img src="' . $l['country_flag_url'] . '" height="12" alt="' . $l['language_code'] . '" width="18" />';
Replace that line with the following one:
echo $l['translated_name']. ' ';
The flags should be now replaced by text names.