new maps for portuguese image localization
updated po files for portuguese (european)
added aoi map (pt)
updated changelog
Merge branch 'master' of https://github.com/trewe/wesnoth-old (PR #71)
Optipng run on pt image l10n

Overall statistics (only for files with a smaller recompressed size):
  Original size: 24 KiB on 2 files
 Optimized size: 23 KiB
   Total saving: 0 KiB = 0% decrease
l10n-track update