This was a moderately busy cycle for documentation, but nothing all that

earth-shaking:

- More Chinese translations, and an update to the Italian translations.
  The Japanese, Korean, and traditional Chinese translations are
  more-or-less unmaintained at this point, instead.

- Some build-system performance improvements.

- The removal of the archaic submitting-drivers.rst document, with the
  movement of what useful material that remained into other docs.

- Improvements to sphinx-pre-install to, hopefully, give more useful
  suggestions.

- A number of build-warning fixes

Plus the usual collection of typo fixes, updates, and more.
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