Frustrating encoding problem (Hebrew UTF8)

Hi dear WP users,

I have a blog (of a friend) I am failing to fix:
https://www.nivcalderon.com/

The language of the website is Hebrew, but the encoding scrambles the output, and I can’t find how to fix it.

I tried changing the DB to be utf8.
I added this:
define(‘DB_COLLATE’, ‘utf8_general_ci’);
To the wp-config
(and also this: define(‘DB_CHARSET’, ‘utf8’);
But removed it later, since it didn’t seem to fix the problem)

Any ideas of what else to do ?

Thanks