Add tools-sbt.md, tools-worksheets.md in ru (#2925)

* Add tools-sbt.md, tools-worksheets.md in ru

* Fix the comment.

Author: artemkorsakov

_overviews/scala3-book/tools-sbt.md

@@ -2,7 +2,7 @@
 title: Building and Testing Scala Projects with sbt
 type: section
 description: This section looks at a commonly-used build tool, sbt, and a testing library, ScalaTest.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 70
 previous-page: scala-tools
 next-page: tools-worksheets

_overviews/scala3-book/tools-worksheets.md

@@ -2,7 +2,7 @@
 title: Worksheets
 type: section
 description: This section looks at worksheets, an alternative to Scala projects.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 71
 previous-page: tools-sbt
 next-page: interacting-with-java

_ru/scala3/book/scala-tools.md

@@ -9,7 +9,7 @@ description: В этой главе рассматриваются два шир
 language: ru
 num: 69
 previous-page: concurrency
-next-page:
+next-page: tools-sbt
 ---
 
 В этой главе представлены два способа написания и запуска программ в Scala: