[Inkscape-translator] en_GB translation update

Hi,

Please find a fully updated version of the en_GB.po file here: http://www.miito.org/files/en_GB.tghs_20081210_0308.po

I should note that within the update, there were 16 original strings which were incorrect in some way. They have been corrected in the translation. However, I do intend to fix the original strings (along with a dozen or so dubious but unchanged ones) when I get a spare moment.

Cheers, Tim