Added czech translations

[limosek]

This pull request is a (multiple allowed):

• [] bug fix
• change of existing behavior
• new feature

Checklist

• User stories are present (given, when, then format)
• Unit tests are passing
• Selenium tests are passing
• Check style is not triggering new error or warning

What you did

Added Czech translations

[CLAassistant]

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[cedricalfonsi]

Hello @limosek,
Thank you for your contribution!
The follow-up tickets for the Czech translation of the application are PB-43712 and PB-43713.
We plan to enable this language in release v5.4.0.
Best regards