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* For quota limit, replaces "Try again tomorrow" with "Try again after
  24 hours", as "tomorrow" is too soon for some time zones. 24 hours
  works in any case.
* For generic error, adds "Try again later", as there are some
  errors where retrying would help (and otherwise it sounds like
  users can't do anything in any of those cases).
* Per our guidelines, removes the period from the end of strings
  if it's a single sentence.

Bug: 1067175
Change-Id: Ide3ac2b2f4da1acefc85fc6934ef2767850cf17f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133973
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756524}