Merge translations from the Translation Project

Update translations from the 2.25 candidate libc.pot.

	* po/cs.po: Merge translations from the Translation Project.
	* po/de.po: Likewise.
	* po/pl.po: Likewise.
	* po/ru.po: Likewise.
	* po/tr.po: Likewise.
	* po/uk.po: Likewise.
	* po/vi.po: Likewise.
	* po/zh_CN.po: Likewise.