hello
Yet the slug not support persian or arabic language letters
in your demo when create news slug "سلام" this error happening:

An unexpected error has occurred!

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Additional information about this error:

MySQL error!

Illegal mix of collations (ascii_bin,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation 'like'(Errno=1267)

Your query: Results::count_total_rows()

SELECT COUNT( * )

FROM stable_slug

LEFT OUTER JOIN stable_items__item ON slug_itm_ID = post_ID

WHERE ((

LOWER(slug_title) LIKE "%سلام%"

OR LOWER(post_title) LIKE "%سلام%"))

سلام = hello