`ENGMSG`または`JPNMSG`への翻訳が欠落している場合は、`ENGMSG`を調整する

[krysyxte]

I don't know how to actually run this project and C++ is way too alien for me to work with, but I wanted to try some form of contribution by adding missing translation values and making slight changes to existing English translations.

#ifdef JPNMSG
   // Japanese text...
#else
   // English text...
#endif