The Add Keyboard dialog box shows all the keyboard files available for international keyboards and allows you to select an appropriate one. You can open it by clicking Add on the Keyboard Settings dialog box.
The Description column shows a meaningful name of a keyboard file. The Name column shows the actual file name of the keyboard file.
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More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.