backport r12453 AbstractAdapter change to 2.4-stable (#15756)

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Merged r12456 from trunk to 2.4-stable (#15756)

change requirement in bazaar lib as same with other scm libs.

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Merged r12695 from trunk to 2.4-stable (#15960)

pt-BR translation for 2.4-stable updated by Leandro Gehlen.

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Merged r12660 (#13544).

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Merged r12652 (#15664).

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Merged r12745 (#15870).

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Merged r12844 (#16038).

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Merged r12848 (#16032).

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Merged r12736 (#15977).

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Merged r12861, updates for 2.4.3 release.

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tagged version 2.4.3

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remove Gemfile.lock

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Merge with bitbucket 2.4.3 tagged revision

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Added tag bb-2.4.3 for changeset dce89627aa4a

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