update 2 command-line parameter help messages

- -checkpoints is now much more understandable and should be way easier
  to translate
- -loadblock uses the same format (blk000??.dat) as -reindex

src/init.cpp

@@ -258,7 +258,7 @@ std::string HelpMessage()
         "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (IPv4, IPv6 or Tor)") + "\n" +
         "  -discover              " + _("Discover own IP address (default: 1 when listening and no -externalip)") + "\n" +
         "  -irc                   " + _("Find peers using internet relay chat (default: 0)") + "\n" +
-        "  -checkpoints           " + _("Lock in block chain with compiled-in checkpoints (default: 1)") + "\n" +
+        "  -checkpoints           " + _("Only accept block chain matching built-in checkpoints (default: 1)") + "\n" +
         "  -listen                " + _("Accept connections from outside (default: 1 if no -proxy or -connect)") + "\n" +
         "  -bind=<addr>           " + _("Bind to given address and always listen on it. Use [host]:port notation for IPv6") + "\n" +
         "  -dnsseed               " + _("Find peers using DNS lookup (default: 1 unless -connect)") + "\n" +
@@ -301,7 +301,7 @@ std::string HelpMessage()
         "  -salvagewallet         " + _("Attempt to recover private keys from a corrupt wallet.dat") + "\n" +
         "  -checkblocks=<n>       " + _("How many blocks to check at startup (default: 2500, 0 = all)") + "\n" +
         "  -checklevel=<n>        " + _("How thorough the block verification is (0-6, default: 1)") + "\n" +
-        "  -loadblock=<file>      " + _("Imports blocks from external blk000?.dat file") + "\n" +
+        "  -loadblock=<file>      " + _("Imports blocks from external blk000??.dat file") + "\n" +
         "  -reindex               " + _("Rebuild blockchain index from current blk000??.dat files") + "\n" +
 
         "\n" + _("Block creation options:") + "\n" +