Update locales rake tasks to support keys of any depth
There's a few options to make managing translation files easier.
The rake tasks can probably be changed to use https://github.com/cherring/i18ndiff (which essentially diffs yaml files, see also https://chrisherring.co/posts/managing-rails-translations) to support keys at any depth.
There is also https://github.com/glebm/i18n-tasks that could be used to this purpose, but this would probably be a bigger change.
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