Add capability to build Japanese PDF documents (issue 316340043 by address@hidden)

[lemzwerg]

LGTm


https://codereview.appspot.com/316340043/diff/1/Documentation/ja/GNUmakefile
File Documentation/ja/GNUmakefile (right):

https://codereview.appspot.com/316340043/diff/1/Documentation/ja/GNUmakefile#newcode7
Documentation/ja/GNUmakefile:7: # By default, Japanese PDF documents are
not builded.
s/builded/built/

https://codereview.appspot.com/316340043/diff/1/Documentation/ja/GNUmakefile#newcode11
Documentation/ja/GNUmakefile:11: # For building Japanese PDF documents
the followings are required.
s/followings are/following is/

https://codereview.appspot.com/316340043/diff/1/Documentation/ja/GNUmakefile#newcode24
Documentation/ja/GNUmakefile:24: #     (This package is for Chinese, but
can also used in Japanese.)
s/in/for/

https://codereview.appspot.com/316340043/