Exercise 1.12 lacks a sentence of translation
Merge branch 'japanese' of https://github.com/minghai/sicp-pdf into japanese
In Chapter 1, at footnote 30, make a sentence more natural Japanese
Fix: rewrite a bit text in Section 1.2.2
In Chapter 1, at footnote 35, Use desu/masu instead of da/dearu
In Chapter 1, at footnote 36, Made it more natural Japanse.