{% for pcat in page.categories -%}
{% assign c_title = '' -%}
{% for cat in site.categories -%}
{% if cat.tag == pcat -%}
{% assign c_title = cat.plural -%}
{% endif -%}
{% endfor -%}
{% if c_title and c_title != '' -%}
{{c_title}}
{% endif -%}
{% endfor -%}