Make short strings unique by using gettext context support

Reported-by: Andrei Popescu <andreimpopescu@gmail.com>

lib/dpkg/parsehelp.c

@@ -198,7 +198,8 @@ const char *versiondescribe
 
   struct varbuf *vb;
 
-  if (!informativeversion(version)) return _("<none>");
+  if (!informativeversion(version))
+    return C_("version", "<none>");
 
   vb= &bufs[bufnum]; bufnum++; if (bufnum == 10) bufnum= 0;
   varbufreset(vb);

src/enquiry.c

@@ -183,7 +183,8 @@ yettobeunpacked(struct pkginfo *pkg, const char **thissect)
     return false;
   case stat_notinstalled: case stat_halfinstalled: case stat_configfiles:
     if (thissect)
-      *thissect= pkg->section && *pkg->section ? pkg->section : _("<unknown>");
+      *thissect = pkg->section && *pkg->section ? pkg->section :
+                                                  C_("section", "<unknown>");
     return true;
   default:
     internerr("unknown package status '%d'", pkg->status);