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Merge #1023

1023: Make `__str__` and `__format__` locale aware r=hgrecco a=hgrecco

With this commit, all string formatting operations are locale aware

    >>> ureg.set_fmt_locale('fr_FR')
    >>> str(accel)
    '1.3 mètre par seconde²'
    >>> "%s" % accel
    '1.3 mètre par seconde²'
    >>> "{}".format(accel)
    '1.3 mètre par seconde²'

It should not break any code as the default locale value for the
Registry is `None` (meaning do not localize).

Close #984

- [x] Closes #984 (insert issue number)
- [x] Executed ``black -t py36 . && isort -rc . && flake8`` with no errors
- [x] The change is fully covered by automated unit tests
- [x] Documented in docs/ as appropriate
- [x] Added an entry to the CHANGES file


Co-authored-by: Hernan <hernan.grecco@gmail.com>
Co-authored-by: Hernan Grecco <hernan.grecco@gmail.com>

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