* fix average speed message.
* update cn, tw command files.

git-svn-id: https://mameplus.svn.sourceforge.net/svnroot/mameplus/trunk/mamep@5147 e0215e0a-1e64-f442-9f1d-d2f61a7f4648
updated jp command.dat (command_0.152) [MRT]

git-svn-id: https://mameplus.svn.sourceforge.net/svnroot/mameplus/trunk/mamep@5148 e0215e0a-1e64-f442-9f1d-d2f61a7f4648