[#727] Refactor gherkin function to filter zaken #1998

Job	Run time
Build and check documentation	1m 14s
Build frontend	1m 7s
Run the Django test suite	2m 28s
Build docker image (production, docker) / Build image	1m 58s
Build docker image (dev, -dev, dev) / Build image	1m 58s
End-to-end tests, chromium	6m 26s
End-to-end tests, firefox	8m 17s
Run storybook tests	2m 36s
End-to-end tests, webkit	7m 14s
Push Docker image	-1s
	33m 17s

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