Background of the issue:
I am trying to add a separate directory for custom English country-specific languages like en_UK for /uk/ on my site link oculto. I want to add /uk/ directory for en-uk; /in/ for en-in; etc.
Symptoms:
The Language code already exists.
Questions:
How do I add a separate directory for custom English country-specific languages like en_UK for /uk/?
Why does it say 'The Language code already exists' when I try to add a directory?