few corrections.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2172 c06c8d41-db1a-0410-9941-cceddc491573
H53LXVICYVVJNETLDPVZGZV7U3SLB2XUOYSMFM2VM6ST226MTBHQC
text += make_stringf(" of the dungeon, and seen %ld of its level",
branches_total.levels_seen);
if (branches_total.levels_seen > 1)
text += "s";
text += ".\n";
text += make_stringf(" of the dungeon, and %s %ld of its levels.\n",
seen.c_str(), branches_total.levels_seen);