feature #1155 Add Slovak language translation. (snickom)
feature #1155 Add Slovak language translation. (snickom)

This PR was squashed before being merged into the master branch.

Discussion
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Add Slovak language translation.

Commits
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470a3e3 Add Slovak language translation.

TomasVotruba/symfony-demo,symfony/symfony-demo,voronkovich/symfony-demo,bocharsky-bw/symfony-demo,TomasVotruba/symfony-demo,symfony/symfony-demo,voronkovich/symfony-demo,bocharsky-bw/symfony-demo,TomasVotruba/symfony-demo,voronkovich/symfony-demo,symfony/symfony-demo,bocharsky-bw/symfony-demo