[Freeciv-Dev] Nonformat string marked as c-format

[Erik Sigra <sigra@xxxxxxx>]

from the freeciv.pot:

#: server/stdinhand.c:549
#, c-format
msgid ""
"A Diplomat or Spy acting against a city which has one or more defending "
"Diplomats or Spies has a diplchance (percent) chance to defeat each such "
"defender.  Also, the chance of a Spy returning from a successful mission is "
"diplchance percent.  (Diplomats never return.)  Also, a basic chance of "
"success for Diplomats and Spies.  Defending Spys are generally twice as "
"capable as Diplomats, veteran units 50% more capable than non-veteran ones."
msgstr ""


Why is it marked as c-format when no substitutions should be done? It bothers 
msgfmt -c. Not only for sv.po.