saved subtitle files not UTF-8

[webwamp]

when saving subtitle in any formats (srt, sub, ...) the file should be UTF-8 for some languages like Persian, Arabic, ... but when save subtitle file, this is not UTF-8 and when use subtitle in video player, the text be unreadable and should copy text into new text file as UTF-8 encoding and save and change text file format to subtitle like srt

i try to use mb_convert_encoding() and utf8_encode() in save function to fix content, but the problem is the saving class not subtitle content, so it is better to fixing this and update git