Added "tetrix in Scala" (EN, JA)

free-programming-books-ja.md

@@ -52,6 +52,7 @@
 * [R](#r)
 * [Ruby](#ruby)
 * [Sather](#sather)
+* [Scala](#scala)
 * [Scheme](#scheme)
 * [sed](#sed)
 * [Smalltalk](#smalltalk)
@@ -423,6 +424,10 @@
 * [Sather を試そう](http://www.shido.info/sather/index.html) - 紫藤貴文
 
 
+###Scala
+* [tetrix in Scala](http://eed3si9n.com/tetrix-in-scala-html5-book)
+
+
 ###Scheme
 * [Gauche ユーザリファレンス](http://practical-scheme.net/gauche/man/gauche-refj.html) - 川合史朗
 * [お気楽 Scheme プログラミング入門](http://www.geocities.jp/m_hiroi/func/scheme.html) - 広井誠

free-programming-books.md

@@ -1369,6 +1369,7 @@ See also [TeX](#tex)
 * [Scala for the Impatient (A1 Scala Level chapters)](http://typesafe.com/resources/book/scala-for-the-impatient) - Cay S. Horstmann
 * [Scala School by Twitter](http://twitter.github.io/scala_school/)
 * [Scala Tutorial](http://www.tutorialspoint.com/scala/scala_tutorial.pdf)
+* [tetrix in Scala](http://eed3si9n.com/tetrix-in-scala-html5-book)
 * [The Neophyte's Guide to Scala](http://danielwestheide.com/scala/neophytes.html) - Daniel Westheide
 * [Xtrace](http://github.com/leithaus/XTrace/tree/monadic/src/main/book/content/)