Where to find string to translate

Hi,

I am translating your great plugin. I see it is already done in Dutch 100%. Great! But after I try to go to the reset password page and the link is not valid no more I see this “That key is no longer valid. Please reset your password again. Code: invalid_key”. I can’t find where this is coming from. It is not theme Avada, not plugins Avada, not your plugin, not toolset plugin. Where can I translate this string?

Cheers

Marco