Replaced English comments with Japanese translations

[Blackweda]

This is a PR to fix issue #12880

This issue is fixing the comment sections for the French and Japanese translations so that the comments are in those respective languages, and not in English.

I looked over both:

samples/fr/Premiers pas
samples/ja/Getting Started

The French translation had already been done, so I worked out the translations for the Japanese and made the changes to the comment sections. If a more accurate translation comes up, please let me know.

This should close the issue if everyone is satisfied with the translations.

Here are the translation equivalents:

自分のファイルで始めましょう
Let’s start with your own file

Brackets のは何ですか
What is Brackets?

ご意見をお聞かせ
Tell us your opinion

HTML、CSSとJavaScriptとの関係
Relationship between HTML, CSS and JavaScript

<3とJAVASCRIPTで作成
Created with <3 and Javascript

ライブ プレビュー
Live preview

[Blackweda]

I had a Japanese friend look over the translations. She only recommended a slight change to two of them because they sounded better to her when she read it that way. Everything else was fine with her.

[ficristo]

Usually Japanese translations are done by the Adobe team. I'm not sure about the samples...
@swmitra @saurabh95 ?

@Blackweda you should revert all the changes to the indentation of the closing -->.

[saurabh95]

Yeah generally Adobe ALF team does translations, but we can definitely get this reviewed by them(since they would be having more context), and get it merged.
@VibhaMalhotra @ArturOledzki @pantkowiak @rajjain Could you please review this?

[Blackweda]

sorry @ficristo , what are you saying about indentation of the closing --> ??
I didn't move anything except change the wording, the placement is still the same from beforehand.

[ficristo]

If you look at the GitHub interface you can notice some changes to lines with the closing -->.
It seems you accindentally convert some spacing to tabs, please undo that.

[Blackweda]

Sorry I had deleted my forked version.. I have to redo all this.