opencart2.x - How replace England flag with french flag in opencart version 2.2.0.0 -

i want change 2 flags french , morocco flags. how can that? search in admin panel there no option allow this.

enter image description here

if go edit language find option image*.

please see image uploading.

you can change image en.png whatever.png , find flags on here

catalog\view\theme\your_theme_name\images\flags