I can't find any .lang files except for us_US.lang

Hi there, so I know that this is technically not a bug, but after 40 minutes of searching online and in files explorer, I can't find any .lang files other than us_US.lang.
Online it says that these files should be stored in either:
.minecraft\versions\1.12.2\assets\minecraft\lang
or
.minecraft\assets\lang
but I can't find them.

The reason why I would like to find them is because I would like to know the differences between let's say English UK and English US.
If someone could please tell me where their stored or if theres some online website where they are stores, thanks!