Updated Czech localization

[Jinderamarak]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Internationalization and localization
• Other (please describe):

What is the current behavior?

• Missing translation for some values
• Missing translation for:
  • Checksum Generator
  • Color Blindness Simulator
  • GZip Encoder Decoder
  • Image Converter
  • Lorem Ipsum Generator

What is the new behavior?

• Unified translation in Number Base Converter
• Corrected a few incorrect words
• Added all missing translations

Other information

Quality check

Before creating this PR, have you:

• Followed the code style guideline as described in CONTRIBUTING.md
• Verified that the change work in Release build configuration
• Checked all unit tests pass

[veler]

Thank you for this :)