[Translators] Update for Slovak translation of VLC Media Player

[Marián Hikaník]

Hello, 
I prepared an update for Slovak translation of VLC Media Player. You can download the translation on: http://www.mojepreklady.net/download/po-sk.zip
All the new strings (strings total: 5453) are translated now. If you can, please upload this translation to your server. 

Thank you in advance. Best regards, 

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Marián Hikaník