Fix localization for Spanish Civil 3D

[angelowang]

In AutoCAD/Civil3D, CurrentUICulture.ToString() will return traditional es-ES_tradnl,
instead of plain es-ES. This will fail the finding of xml document, gallery, and sample folders later.

This change uses CurrentUICulture.Name instead.
From MS DOC for CultureInfo.Name:

Gets the culture name in the format languagecode2-country/regioncode2.

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Reviewers

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FYIs

[QilongTang]

@angelowang Thank you, LGTM, will merge and run tests on it