Rename the desktop and AppStream data files to conform to the AppStream
1.0 specification; these now have names based on "au.org.zap.trader".
Add a caption to the AppStream screenshot; update all translations to
suit. Rename msgfmt-appdata to msgfmt-metainfo to reflect these changes.
All translations of Star Traders are present as stored on the Translation
Project website at https://translationproject.org/latest/trader/,
downloaded with "wget -nH --cut-dirs=2 -r -np".
Original dates:
da.po 2017-05-21 15:42
en_GB.po 2019-11-13 20:52
es.po 2018-03-29 23:17
fi.po 2015-09-19 12:52
hr.po 2012-04-19 16:27
ro.po 2023-10-01 17:57 (new translation)
ru.po 2012-03-29 10:27
