Javascript without problems works with cyrillic symbols. It is a problem of code WWF, but not Javascript. I can assume that in a code of a forum there is some part of a code which can influence not latin symbols, for example with a view of safety of a forum. I have lead following experiment:
The part of a code:
<input type = "submit" name = "Submit" id = "Submit" value = " <% = strTxtOK %> ">
has been copied by me so:
<input type = "submit" name = "Submit" id = "Submit" value = "ДА">.
I have placed this part of a code directly here: RTE_popup_file_atch.asp
At start of file RTE_popup_file_atch.asp these symbols have been displayed in not readable kind. But as soon as the coding in a file browser_page_encoding_inc.asp was is changed on "utf-8"
String 58 Const strPageEncoding = "utf-8"
these symbols it is possible was normal prohonour.
But if to place translation of a word "OK" on Russian "ДА" in file RTE_language_file_inc.asp:
String 139: Const strTxtOK = "OK"
we Replace on
String 139: Const strTxtOK = "ДА"
Symbols "ДА" are not displayed At all: