Add descriptive titles to po files and header.

Added descriptive titles to the Belarusian,
English (American), and Chinese (simplified)
po/pot files.

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2013-05-28  Carlos O'Donell  <carlos@redhat.com>

	* po/be.po: Add descriptive title.
	* po/zh_CN.po: Likewise.
	* po/header.pot: Likewise.