Changed weight/volume to UK metric. Changed short distances to metric.

Weight/Volume is metric in the UK (Kg and Litres). Short distances are metric (cm or m), but long distances are imperial (Miles). We have strange system in the UK!. Language code also changed to 'en' for English instead of 'gb'.

Will create list of states (counties) for the UK when I get chance. (P.S. first post... hope I've done this right.)