THE SITUATION:
I need to insert flags inside the language select. I have searched in Google and StackOverflow but the solutions founded are not work
As other answers you can not use
to add an image, however you can use angular module ui-select to achieve what you want to do.
Here is a demo with ui-select with your data.
Clean up the code and get what you need.
If you're not interested in search box override the CSS as,
.select2-search {
display: none;
}
DEMO