Add project is_public to GET /projects/:id and /projects API response (#17628).

Contributed by Michael Esemplare <michael.esemplare@gmail.com>

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fix typo in Traditional Chinese detailed syntax help (#17585)

Contributed by Felix Schäfer.

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Bringing together of the translation of Members at Polish translation (#17552)

Contributed by Dariusz Kowalski.

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Galician translation updated by Adrián Chaves Fernández (#17563)

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remove unneeded setting self[left_column_name] and self[right_column_name] from Issue#update_nested_set_attributes_on_parent_change (#6579)

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