Update and improve Czech(Česky)(cs_CZ) locale using Claude 3.5 Sonnet (#2748)

Leverage Claude 3.5 Sonnet from Anthropic, a cutting-edge LLM model, to
improve translation outcomes. In #2164, the previous use of Qwen2.5 7b a
smaller and less advanced AI model) was an earlier attempt that may have
resulted in suboptimal quality and user experience. While relying solely
on LLMs for translation is generally not ideal, adopting a more advanced
model like Claude 3.5 allows us to address these earlier limitations and
ensures significantly better results, even for a language I do not
understand.

Furthermore, I also use the powerful frontier OpenAI GPT-4o and Google
Gemini-1.5-Pro for proofreading, and thoroughly examined and verified
line breaks to ensure accuracy and facilitate easier contributions and
improvements by others.