Japanese translation

[hiroshisuga]

What does this PR do?

Adds a translation of the locale ja.

Closes Issue(s)

Closes #

Motivation

Is it the correct way to add a translation? Hopefully more locales will be added to the branch for v3.0

[welcome]

Thank you for this contribution! Could you please confirm if you already sent in the signed Contributor License Agreement? See https://docs.bigbluebutton.org/support/faq.html#why-do-i-need-to-sign-a-contributor-license-agreement-to-contribute-source-code Thanks in advance!

[GuiLeme]

Hello, @hiroshisuga thank you for the contribution, that is correct! But unfortunately we are not currently doing locales yet for this plugin. I will add this feature soon enough, though, and this PR will gladly make a great difference here! Thanks again and I'll keep you up to date.

[antobinary]

Hi! In the community call yesterday a request for German translation was voiced too. @GuiLeme are we happy enough with the localization (via PRs) for any of the plugins? Perhaps we could mimic here what we do in bigbluebutton/plugin-tour#6

[GuiLeme]

@antobinary The thing is: we didn't have a pattern to follow before, but now, we are defining it as we can see here: bigbluebutton/plugin-typed-captions#8.

So I think we should try to stick with this pattern quoted above which follows what we do in BBB core. But that's definitely a good discussion

[antobinary]

Thank you @GuiLeme ! I see #39