Translating the word “(optional)” from a field

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Hello Guys, I’m making a local language of my woocommerce based site. When you had a field with “required”=>false, the placeholder will have “(optional)” suffix. (see: https://www.screencast.com/t/6bwoPaRy)

i want to translate this but can’t ?
i already search the .po (by using Loco Translate plugin) but not found “(optional)” phrase…

There’s “Optional” phrase but translating it does not have affect on the front end (https://www.screencast.com/t/Qo0Nj92H)

I tried to find from the source code, but has not been able which part that triggered this word

Anybody can help ?

Thanks

*note: i have no problem with other phrases in translation