.../unicode/cstab.html
https://www.iana.org/assignments/character-sets/character-sets.xhtml
A good alternate choice is : charset="UTF-8"
Also, you can edit the main script and search for and change the charset setting temporarily or permanently.
Another technique to identify charset for a particular language is to do Google Search for that language websites, open them one by one and right click them to View Page Source ( on Google Chrome Browser ) and search/copy the charset setting used.