Creating extension fields in multiple languages for 1 database
 When an extension field is added to Symbol form using a browser in the
      System Default Language (for example, EN-US), the extension field is only
      added to the Field Label for the EN-US Validation
      Code.
For other languages defined in the database, the administrator must open the Symbol form in a browser for the other language, specify the extension field labels in the Input Label column and save the Symbol. This adds the extension field labels to the Field Label for other languages.