Czech translation for 2.5-stable updated by Karel Pičman (#16453)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013015
Czech translation for trunk updated by Karel Pičman (#16453)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013016