add test of issue id in sending mail when issue is created by mail (#17078)

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Gemfile: update builder version >= 3.0.4 (#17309)

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Japanese translation changed by Go MAEDA (#17346)

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prevent "can't modify frozen String" exception when mail sending error (#17235)

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fix file upload broken on Chrome 36 (#17151)

Contributed by Felix Schäfer.

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