cksum: small improvements, l10n #14134

Job	Run time
Style/toml	14s
Style/lint (ubuntu-latest, all, true)	1m 18s
Style/format (ubuntu-latest, feat_os_unix)	14s
Style/lint (macos-latest, feat_os_macos)	1m 22s
Style/lint (windows-latest, feat_os_windows)	2m 33s
Style/spelling (ubuntu-latest, feat_os_unix)	16s
Style/Python	9s
Pre-commit hooks	23s
	6m 29s

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