Countdown labels

How does one translate the countdown labels. It says days, hours, minutes and seconds, but I can’t find those back in the translation files. I though it might be grabbed from Wordpress Core, although my localization is already in dutch.

See example on live site
https://overdedrempel.frl/

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Is this still the way to get theme support or did everything change to peer support now?

I have the exact same question, can anyone help us?