updated CHANGELOG for 2.1.9
update CONTRIBUTORS for 2.1.9
updated VERSION for 2.1.9
[Validator][translation][japanese]replaced period to japanese one
[Validator][translation][japanese]fixed japanese translation to more practical one
[Validator][translation][japanese]fixed message ordering to be consistent with other languages
[Validator][translation][japanese]added new validation messages in japanese translation
bumped Symfony version to 2.1.10-DEV
merged branch 77web/validator-translation-ja (PR #7478)

This PR was merged into the 2.1 branch.

Discussion
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[Validator] [translation] updated Japanese translation for Validator component

| Q             | A
| ------------- | ---
| Fixed tickets | N/A
| License       | MIT

I will also update translations for new messages available after 2.2 once this request is merged.

Commits
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987aded [Validator][translation][japanese]replaced period to japanese one [Validator][translation][japanese]fixed japanese translation to more practical one [Validator][translation][japanese]fixed message ordering to be consistent with other languages [Validator][translation][japanese]added new validation messages in japanese translation
Keep the file extension in the temporary copy and test that it exists (closes #7482)
Fixed long multibyte parameter logging in DbalLogger:startQuery
merged branch burci/doctrinebridge-dballogger-bug (PR #7497)

This PR was merged into the 2.1 branch.

Discussion
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[2.1][2.2][2.3][Bridge][Doctrine] Fixing long multibyte parameter logging in DbalLogger:startQuery

See #7484

Commits
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64a1d39 Fixed long multibyte parameter logging in DbalLogger:startQuery