Layout “isotope” – edit $categories

Hello,

i need some help. There’s the string $categories in the isotope layout:
/lib/views/layouts/isotope1.php line 58.
I have the problem that if a post is within 2 or more different categories, the categories are shown as “category1 ,category2”. I want to delete the “,” between the two categories in the frontend.

Where can I find the file to do it?

Thanks, Astrid

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