Garbage pickup date (mijnafvalwijzer.nl) custom_component

I have been running this integration for a pretty long time now. There is one thing which annoys me a little.

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On the right site the date is English while my frontend is Dutch. Now I have been searching this and to Localisation fix - Feature Requests - Home Assistant Community (home-assistant.io) which shows I have to edit my template. And by the likes I don’t know how to do that. I also read through this site where it has been mentioned a few times, but can’t seem to figure out what is needed to fix this. Any pointers?

The following code is responsible for the date:

        type: custom:template-entity-row
        state: |
          {{as_timestamp(strptime(states(config.entity),'%d-%m-%Y'))
              |timestamp_custom('%-d %B')}}