Normalize cs.json to LF line endings
The Czech catalog was the only file in the repo still using CRLF, which made every edit to it show up as a whole-file rewrite in diffs and hid the one line that actually changed. Content is byte-identical apart from the line endings, and the file now matches the exact json.dumps(indent=2, ensure_ascii=False) formatting the other four catalogs already use.
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