Oracle Enterprise Manager font problem, some text is displayed in Chinese and with squares
Oracle Enterprise Manager Grid Control Advanced Installation and Configuration Guide 11g has the following section:


  How can you change the language used in Enterprise Manager Grid Console?
  
  By default, the Enterprise Manager Grid Control Installation Wizard
  installs Enterprise Manager Grid Control console with English
  language. If you want to view them in another language, then select
  the required languages in the Select Languages screen of the
  installation wizard.
  
  
    Note: The language you select here changes the language used in the
    Enterprise Manager Grid Control console screens only; it does NOT
    change the language used in the installation wizard screens. The
    language of the installation wizard screens is based on the operating
    system language.
  
  
  When you select additional languages to install, the installation
  wizard also installs fonts required to display the languages.
  
  For some components, languages are installed only if you select them
  during installation. In this case, if you access the application in a
  language that is not available, it reverts to the locale language.
  
  For other components, available languages are installed regardless of
  what you select during installation. In this case, however, fonts are
  installed only for the languages that are explicitly selected. When
  you access the application, it uses text in your language because the
  language was installed. However, if you do not have the appropriate
  fonts to render the text, the text appears as square boxes. This
  usually applies to the Chinese, Japanese, and Korean languages.