If I’m understanding your link drop correctly, I appreciate the sentiment, but my two thoughts on this are:
1. Countries are not languages, and vice-versa. There isn’t a 1:1 mapping. There’s a whole bunch of negative cultural and political identity nuances when people attempt to assign a flag to a language. For example, English is spoken far and wide, not only in England. Spanish is spoken in the Americas, not only in Spain.
2. There’s already emojis for country flags if somebody needs to add them to text! 

 Hadn’t thought about that…

So, ui for picking a language should not have flags? 

Prolly good idea. Thanks.  

 No, they shouldn’t have flags. It should just be at a minimum the name of the language itself as written natively. Here’s an example from the iPhone language selector. https://i.nostr.build/zd8Od.jpg