RFR: 8265106: IGV: Enforce en-US locale while parsing ideal graph

[Yi Yang]

On Mon, 19 Apr 2021 04:48:07 GMT, Yi Yang <yyang at openjdk.org> wrote:

> IGV is designed to support parsing incomplete XML. However, it does not work for non-English users. See XXPR for the detailed reasons. This patch would address it.
> 
> (P.S. Locale.ENGLISH also does not work, see  Philip Helger' [comment](https://stackoverflow.com/questions/18531633/locale-specific-messages-in-xerces-2-11-0-java) on the first answer.)

Thanks @robcasloz  for giving this purposed fix!

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PR: https://git.openjdk.java.net/jdk/pull/3563