Nothing hugely exciting happening in the documentation tree this time

around, mostly more of the usual:

- More Spanish, Italian, and Chinese translations

- A new script, scripts/checktransupdate.py, can be used to see which
  commits have touched an (English) document since a given translation was
  last updated.

- A couple of "best practices" suggestions (on Link: tags and off-list
  discussions) that were not entirely at consensus level, but I concluded
  they were close enough to accept.

- Some nice cleanups removing documentation for kernel parameters that have
  not been recognized for ... a long time.

...along with the usual updates, typo fixes, and such.
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