i18n: Update Czech

[ceskyDJ]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.15%. Comparing base (df03da8) to head (84b0093).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1436   +/-   ##
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  Coverage   47.15%   47.15%           
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  Files         114      114           
  Lines        9002     9002           
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  Hits         4245     4245           
  Misses       4757     4757           

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[ceskyDJ]

Hi, @adil192! It's a pretty long time since there was a last change in i18n!

I have some notes on this translation:

• At first, I translated the description a bit differently, so it's a little more informative (at least from my point of view). Instead of your version, I used something like “Background template's lines thickness”. There is a little problem with the meaning of “line“ in Czech, so I used two forms to describe it more precisely (to add more context for the user).
• The second note is about a preview. Line height (option just above this one) has a real-time preview, but there is nothing like that for line thickness. Could you please add it?