The translate mechanism in Draft depends on the `QtCore`
`translate` function. This is defined in its own module
so that `DraftGui.py` is not as big and hard to manage.
Other modules in Draft can import the translate function
without needing to import the entire interface, which
often causes errors and circular dependencies.
We can import `QtCore.QT_TRANSLATE_NOOP` at the top level
in `Draft.py` because it does not depend on the graphical
interface.
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