po/POTFILES.in: Add missing source files
po/POTFILES.in: Add missing source files

We forgot to add these when splitting existing or creating new source
files.

Signed-off-by: Lukas Fleischer <af90e31281d8305af43dc616c5aaca3c7165f8a7@cryptocrack.de>

lfos/calcurse,lfos/calcurse,lfos/calcurse