FIX: translation text for 707 420 BOAC

Signed-off-by: Milko <Beppe@giuseppe.(none)>
fix.
Merge branch 'master' of https://github.com/jamespetts/simutrans-pak128.britain.git into Payload
ADD: Boeing 707 320C Pelican Cargo Airlines (Post)
FIX: Incorrectly scaled graphics for the LBSCR suburban carriages.
FIX: LBSCR Marsh era livery introduction date was incorrect