Update "Updating the locale files" section
Update "Updating the locale files" section

The rails_translation_manager advice is still correct, but worth
noting we performed a huge translations update in November 2021,
and therefore wouldn't expect there to be _too_ many untranslated
values at this stage.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall