chore(translations): czech translation improvements

[MrFriggo]

Description

Thanks to machine translation, some words or phrases were mistranslated or not translated at all. I have corrected these incorrect translations.

• "API klíč" is more commonly used than "Klíč API"
• "Přidat odkaz" is not a title, but a noun, so odkaz is lowercase
• "Automatické, Tmavé, Světlé" are adjectives that should be in the first declension in this sense -> "Automatický, Tmavý, Světlý"
• "Úpravy" should also be in the first declension -> "Úprava"
• "Payload" shouldn't be translated because it's general name
• "Crop" is translated as crop and not as photo crop -> "Ořez"
• A focal point is "ohnisko" too, but in this sense "středobod" is meant

• I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• Chore (non-breaking change which does not add functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Change to the templates directory (does not affect core functionality)
• Change to the examples directory (does not affect core functionality)
• This change requires a documentation update

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• Existing test suite passes locally with my changes
• I have made corresponding changes to the documentation