i18n-ja: synchronized with ec17ddecdf64

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branch : stable
merge with i18n

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branch : stable
Added tag 2.6.3 for changeset 009794acc6e3

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branch : stable
Added signature for changeset 009794acc6e3

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branch : stable
Merge with stable.
tests: run pyflakes on files from manifest which could be python files

Skip a binary file because pyflakes 0.4.0 aborts on it.
cleanup: drop unused variables and an unused import
summary: remove passing of rev because summary does not have this

The command summary does not have a rev argument, so passing this results
is None always. Therefore pass None explicitly.

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extra : rebase_source : a454a9a7e870f61926d66e35db46587741ff3ecc