Fix inaccurate 'countries' heading on news.
Fix inaccurate 'countries' heading on news.

Because not all international locations that could be associated with a news
article through tags are countries - they could also be territories or
international institutions - the label 'countries' in the right-hand column on
news articles does not work. Changed to 'UK & the world'.

YOTOV-LIMITED/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall,robinwhittleton/whitehall,askl56/whitehall,alphagov/whitehall,robinwhittleton/whitehall,askl56/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,askl56/whitehall,hotvulcan/whitehall,ggoral/whitehall,hotvulcan/whitehall,ggoral/whitehall,askl56/whitehall,alphagov/whitehall,alphagov/whitehall,hotvulcan/whitehall,ggoral/whitehall,alphagov/whitehall,hotvulcan/whitehall