Thank you for the suggestion, but i need only the first letter of the first word to be uppercase.
I've tried this so far (as suggested by a friend), but with no success (it says zero rows affected after i simulate query).
UPDATE `ps_feature_value_lang` SET `value`= CONCAT(UCASE(SUBSTRING(`value`, 1, 1)), LOWER(SUBSTRING(`value`, 2)))
Am i missing something?