Custom Polylang flags can display too big on the frontend

[wp-seopress]

Custom flags in admin bar need some CSS to restrict height/width to avoid this (see screenshot)

[wp-seopress]

Doesn't work if admin bar is displayed on frontend

[remyperona]

Reopening per previous comment. We don't want to load any CSS on the front-end, so we probably need to edit the image markup directly to force a max-width/height everywhere