Windows: reorganize localized documentation, each in a dedicated folder. Adapt installers and documentation URL logic.

Now we have 3 folders under html directory：en, ru, zh-cn. Similar separation exist in online version:
https://veracrypt.fr/en
https://veracrypt.fr/ru
https://veracrypt.fr/zh-cn

doc/chm/create_chm.bat

@@ -1,11 +1,30 @@
 PATH=%PATH%;C:\Program Files (x86)\HTML Help Workshop
 
 set CHMBUILDPATH=%~dp0
-cd %CHMBUILDPATH%
+cd %CHMBUILDPATH%\en
 
-xcopy /E ..\html\* .
+xcopy /E ..\..\html\en\* .
 
 hhc VeraCrypt.hhp
 
-del /F /Q *.html *.css *.jpg *.gif *.png *.svg
-rmdir /s /Q CompilingGuidelineWin ru
+del /F /Q *.html *.css *.jpg *.gif *.png *.svg *.js
+rmdir /s /Q CompilingGuidelineWin
+
+move /Y "VeraCrypt User Guide.chm" "..\VeraCrypt User Guide.chm"
+
+cd %CHMBUILDPATH%\zh-cn
+
+xcopy /E ..\..\html\zh-cn\* .
+
+hhc VeraCrypt_zh-cn.hhp
+
+del /F /Q *.html *.css *.jpg *.gif *.png *.svg *.js
+rmdir /s /Q CompilingGuidelineWin
+
+move /Y "VeraCrypt User Guide.zh-cn.chm" "..\VeraCrypt User Guide.zh-cn.chm"
+
+cd %CHMBUILDPATH%
+
+
+
+

doc/chm/zh-cn/VeraCrypt_zh-cn.hhp

@@ -1,6 +1,6 @@
 [OPTIONS]
 Compatibility=1.1 or later
-Compiled file=VeraCrypt User Guide_zh-cn.chm
+Compiled file=VeraCrypt User Guide.zh-cn.chm
 Contents file=VeraCrypt_zh-cn.hhc
 Default Font=微软雅黑,9,0
 Default topic=Documentation.html