key=java.launcher.opt.header in jdk/src/java.base/share/classes/sun/launcher/resources/launcher_*.properties

The original value in launcher.properties is

    java.launcher.opt.header = Usage: {0} [options] class [args...]\n\
    \ (to execute a class)\n or {0} [options] -jar jarfile [args...]\n\
    \ (to execute a jar file)\n\
    \ or {0} [-options] -mp <modulepath> -m <modulename>[/<mainclass>] [args...]\n\
    \ (to execute the main class in a module)\n\
    where options include:\n


In launcher_ja.properties,

    +java.launcher.opt.header = 使用方法: {0} [-options] class [args...]\n (クラスを実行する場合)\n または {0} [-options] -jar jarfile [args...]\n (jarファイルを実行する場合)\n または {0} [-options] -mp <modulepath> -m <modulename> | <modulename>/<mainclass>\n (モジュールのメイン・クラスを実行する場合)\noptionsには次のものがあります。\n

Expected:
 no char '-' for in "[options] class [args...]"