Cleanup unused code

Emirequested to merge
(removed):cleanup-unused-code into master
  • Removes the unused .user() and .unit() methods
  • Removes commented out code leftover from weblate days
  • Fold .changes() into .fetch_items(), since
    • .changes() is only ever called once
    • .changes() is a misnomer from weblate
    • .changes() didn't do anything other than call .fetch_items()
  • Incidentally fixes the from_date parameter, which was dropped in the previous .changes() method

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