Ja guide translation (sugarlabs#931)

* change ループ to ずっと based what I am seeing in other programming languages

* Added translations to the drum sounds

* Duplicate folder of English guide for Japanese translation

* Translated the very top of README | I am taking some artistic license (i.e. not a literal translation)

* Translations to some of the chapters of the README | Stopping for a second to test GH

* Broken link; committing so that I can test GitHub some more

* Changes to README and to ja.po | Translating scale/mode names is very difficult!

* correct some errors ＃--> ##

* update local.ini file

* change "taiko" to "drum" based on expected preference

* effect --> effecta based on https://synth-voice.sakura.ne.jp/synth-voice/html5/synth-basic01.html

* 移動ド not 動ける based on https://ja.wikipedia.org/wiki/%E7%A7%BB%E5%8B%95%E3%83%89

* Well, the fact that ソル is suppose to be ソ solves another issue anyway...

* update local.ini so that Devin can test recent changes

* a few more edits to ja.po

* Stop fooling myself that anyone in Japan would call it "ongaku block(s)"; also confirmed with Chie

* Executive decision that we have ネズミさん. No Kanji, no "sensei" b/c that felt too heavy

* ...a few more changes. I think Lilypond makes more sense in English.

* ...update local.ini again

* ...a few more changes based on what I see in UI.

* ...update local.ini

* ...a few more edits based on my modest testing.

* ...update local.ini

* Checked my translations against Scratch's ja.po file | Changed "Play" and some other words

* ...update local.ini