sprint 28 - czech language update

[ghost]

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[jasonsanjose]

@hansek can you review these czech updates from @kvarel? Thanks again.

[hansek]

@jasonsanjose reviewed, looks great! Thanks @kvarel.

[jasonsanjose]

@kvarel can you merge with master? Assuming you have a remote named upstream that points to this repository, you can do the following:

git checkout patch-5
git fetch upstream
git merge upstream/master
git push origin patch-5

If you have any issues, I can do this for you. Just let me know.

[jasonsanjose]

Closing. See #4678.