I remember this icon in some of previous release, but in this version I can't find this option.
And now I wish to know: is it possible to enable in 18.0.1 ?
What do you mean with a language lock in address bar?
Are you using different keyboard layouts and regularly switch to another language or do you mean the language that is used in the user interface?
Can you attach a screenshot?
Use a compressed image type like PNG or JPG to save the screenshot.
Yep, I'm using different keyboard layouts and yes, I regularly switch to another language. But in address bar I use only english, but always forgot to change on english.
It was there as grey lock icon with "En".