Hello,
All our translations are already fully up-to-date for 3.1.3 (because no
strings changed from 3.1.2).
However, it's probably always possible to improve a translation, so now is
the time to do it if you find it necessary :)
You can grab the up-to-date po files from there :
http://code.toofishes.net/pacman/po_files/
Two comments about these po files :
1) The c-format tag was added to every strings for catching strings format
errors (for example if msgstr contains a %s, but not msgid)
Ref: http://www.archlinux.org/pipermail/pacman-dev/2008-February/011276.html
2) all line numbers were removed, because they caused us more harm than good
Ref: http://www.archlinux.org/pipermail/pacman-dev/2008-March/011332.html