Your site content is supported in any Language, we just need to enable the site to recognize the encoding.
The entire Site Encoding can be changed from Control Panel > Site Properties > Special Features
The Page Encoding for individual pages can be changed in the Page Options > Additional Options section
If you have the ability to type the Alternate Language Encoding with their keyboard, you can type the content directly into the editor. You can also Copy/Paste content as long as it is in the correct encoding that is set for the page/site.