en_GB: don't translate <span color=""> to <span colour="">
I have now fixed this twice in GNOME Boxes. Shame on me for not fixing this script the first time around.
The approach here is to ignore the source word if it is followed by a "=". This is perhaps a bit heavy-handed but I skimmed the list of words and I can't think of any legitimate cases where they would be followed by "=".
I also fixed a number of unrelated errors which prevented me from pushing to the gnome/gnome-i18n repo but it became clear that it was just a game of whack-a-mole so I gave up.