Add Japanese translation of scala-for-java-programmers#1416

Merged

eed3si9n merged 4 commits intoscala:masterfrom

exoego:ja/for-java-programmers

Jul 11, 2019

Commits on Jul 11, 2019

Do not remove language code from page.url
exoego
committed
Add Japanese translation
exoego
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Use bold instead of italic which is not eye-friendly in Japanese fonts.
exoego
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Rephrase with more common word.
exoego
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