Merge pull request #289 from mikeboehm/master

A couple of code examples contained mistakes
Translated core-libraries into ja
Merge pull request #290 from potix2/ja-core-libraries

Translated core-libraries into ja
add new validation methods to docs and migration guide
The note talks about including the SessionHelper, but the sample code does not. Here is a fix for that.
Merge pull request #291 from vinhboy/master

Include the SessionHelper in the sample code.
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Merge pull request #1 from azur29/patch-1

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continue translation
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