Its possible to add an English UK translation in the same way you add any other translation. If you write one, I for one would use it.

( I just don't feel as strongly as you to spend my time writing the translation )

It's not the point. English did not come from the U.S.A. and it comes from ENGLAND (UK). USA english is so corrupted by deliberate spelling changes, I find it insulting and frustrating that I get told my English spelling (U.K. english) is wrong, when it is not.

The problem is that no one up to now has ever taken the time to deliver the UK English translation. You have to understand that all translation is done on voluntary basis. If you wish to participate in the translation of Concrete5, I suggest you to sign up onhttps://www.transifex.com/projects/p/concrete5/.... That is how every body else is doing it.
I have fx. translated concrete5 to Danish in the last 6 years - for free...

Just to add...:
The UK translation is actually on transifex, and the status is as follows:

Total: 4089 strings, 21134 words
Translated: 67 strings, 367 words
Remaining: 4022 strings, 20767 words
Reviewed: 0 strings

My English (UK) should not be the one translated, It should should be the default. English U.S.A should be the one translated ...

Just to clarify... Concrete5 is produced in the US...

Did you actually register just to post these messages? I admire your convictions, sir – wrongheaded though they may be.

Has that helped adoption of C5 in Denmark, having it translated?