update japanese
Merge pull request #411 from kyouryuukunn/update_japanese

update japanese
sl2: Introduce three levels of const-ness.

This lets us distinguish compile-time constants from expressions
that are const within a single screen.
Re-prepare screens when rebuilding styles.
Add gallery testcase.
enable customizing the look of gallery navigation
rename gallery_nav to gallery_gavigation
Merge pull request #413 from kyouryuukunn/gallery_nav

enable customizing the look of gallery navigation