RFR: 7421: Update Japanese translation for pages

[Marcus Hirt]

On Mon, 20 Sep 2021 12:56:50 GMT, mohno007 <duke at openjdk.java.net> wrote:

> This PR updates/improves Japanese translation for pages.
> 
> Update texts based on new commits to `messages.properties` made after the last update date of the `messages_ja.properties`.
> 
> You can see decoded version of `messages_ja` using this script:
> 
> 
> native2ascii -reverse application/l10n/org.openjdk.jmc.flightrecorder.ui.ja/src/main/resources/org/openjdk/jmc/flightrecorder/ui/messages/internal/messages_ja.properties

Changes requested by hirt (Lead).

application/l10n/org.openjdk.jmc.flightrecorder.ui.ja/src/main/resources/org/openjdk/jmc/flightrecorder/ui/messages/internal/messages_ja.properties line 2:

> 1: #
> 2: #  Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.

Should update copyright year.

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PR: https://git.openjdk.java.net/jmc/pull/310