[Weblate] Update source files (.pot) from r54608 to r54689 - translate-dev

[Danilo G. Baio]

Synced with r54689, latest commit in the tree.
Last update was r54608 (2020-10-18).

Changed documents:
  - articles/committers-guide
  - articles/contributors
  - books/handbook
  - books/porters-handbook

https://translate-dev.freebsd.org/
-- 
Danilo G. Baio (dbaio)
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