Update problem.ja.md
Update problem.ja.md

The previous version was very good (I mean, appeared natural Japanese to me).
Since "listen" has been used in Japanese technical documents commonly, 「リッスン」 might appear strange (it did to me).
Regarding "(listen) port", IMO we use both "port" and 「ポート」. "listen" is a somewhat special term.
Please don't ask me why. :-)
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