The English UK localisation is completely incorrect, it looks like it's still just English US. Things like channel brand in settings display "Profile Accent Color" instead of "Profile Accent Colour" and other words that are different between the two regions just use the US version. Words ending in -ise have been and are spelt as ending in -ize (even before dictionaries started adding -ize versions as the "main way", which I don't agree with but even before that they were spelt ending in -ize).
Someone needs to go through and fix all of the errors, actually localising it.