Hello
i see a bug on product editing page. the close button for images overlaps on set default image in RTL
it is easy to fix just add this to adminn/themes/new-theme/public/theme_rtl.css but it will vanished on next update so it should be included in official release
.product-page #product-images-form-container .close { left: 0.5em; right:auto; }
if prestashop loaded adminn/themes/default/css/overrides_rtl.cs in product page, we could fix it by our own until next update
i hope there be some consideration from prestashop team to allow custom css on backend freely