Update runtime files.
diff --git a/src/po/cleanup.vim b/src/po/cleanup.vim
index 4bb7ae7..90e7f30 100644
--- a/src/po/cleanup.vim
+++ b/src/po/cleanup.vim
@@ -12,6 +12,9 @@
 silent g/^#, c-format\n#/.d
 silent g/^#\..*\n#/.d
 
+" c-format comments have no effect, the check.vim scripts checks it.
+silent g/^#, c-format$/d
+
 silent g/^#[:~] /d
 silent g/^#, fuzzy\(, .*\)\=\nmsgid ""\@!/.+1,/^$/-1s/^/#\~ /
 silent g/^msgstr"/s//msgstr "/