Add "Functional programming" section in russian. (#2651)

Co-authored-by: Dima Kotobotov <[email protected]>

Author: artemkorsakov

_overviews/scala3-book/collections-classes.md

@@ -2,7 +2,7 @@
 title: Collections Types
 type: section
 description: This page introduces the common Scala 3 collections types and some of their methods.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 37
 previous-page: collections-intro
 next-page: collections-methods

_overviews/scala3-book/collections-intro.md

@@ -2,7 +2,7 @@
 title: Scala Collections
 type: chapter
 description: This page provides and introduction to the common collections classes and their methods in Scala 3.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 36
 previous-page: packaging-imports
 next-page: collections-classes

_overviews/scala3-book/collections-methods.md

@@ -2,7 +2,7 @@
 title: Collections Methods
 type: section
 description: This page demonstrates the common methods on the Scala 3 collections classes.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 38
 previous-page: collections-classes
 next-page: collections-summary

_overviews/scala3-book/collections-summary.md

@@ -2,7 +2,7 @@
 title: Summary
 type: section
 description: This page provides a summary of the Collections chapter.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 39
 previous-page: collections-methods
 next-page: fp-intro

_overviews/scala3-book/fp-functional-error-handling.md

@@ -2,7 +2,7 @@
 title: Functional Error Handling
 type: section
 description: This section provides an introduction to functional error handling in Scala 3.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 45
 previous-page: fp-functions-are-values
 next-page: fp-summary

_overviews/scala3-book/fp-functions-are-values.md

@@ -2,7 +2,7 @@
 title: Functions Are Values
 type: section
 description: This section looks at the use of functions as values in functional programming.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 44
 previous-page: fp-pure-functions
 next-page: fp-functional-error-handling

_overviews/scala3-book/fp-immutable-values.md

@@ -2,7 +2,7 @@
 title: Immutable Values
 type: section
 description: This section looks at the use of immutable values in functional programming.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 42
 previous-page: fp-what-is-fp
 next-page: fp-pure-functions

_overviews/scala3-book/fp-intro.md

@@ -2,7 +2,7 @@
 title: Functional Programming
 type: chapter
 description: This chapter provides an introduction to functional programming in Scala 3.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 40
 previous-page: collections-summary
 next-page: fp-what-is-fp

_overviews/scala3-book/fp-pure-functions.md

@@ -2,7 +2,7 @@
 title: Pure Functions
 type: section
 description: This section looks at the use of pure functions in functional programming.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 43
 previous-page: fp-immutable-values
 next-page: fp-functions-are-values

_overviews/scala3-book/fp-summary.md

@@ -2,7 +2,7 @@
 title: Summary
 type: section
 description: This section summarizes the previous functional programming sections.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 46
 previous-page: fp-functional-error-handling
 next-page: types-introduction