Update translations from SUMMARY.md.
Unfortunately, poedit changes the wrapping length of the po files and I
could not get it back by changing the poedit setting for line length. I
believe we won't get any more of these noisy diffs for my further
changes this week.
`Cancellation` is the last item I modified in this PR.
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Co-authored-by: Hidenori Kobayashi <hidenorik@google.com>