Add filters to {{#foreach posts}} on the author.hbs page

Hi all,

Since I made my ghost blog multi-language, I kinda run into never ending troubles.
One of them is having the author page spitting out all the translations of every posts.

So I’m trying to filter these posts to just one private tag “hash-en” here:
{{#foreach posts}}
{{!-- The tag below includes the markup for each post - partials/post-card.hbs --}}
{{> “post-card”}}

So this on the author.hbs page spits somehow every posts from the author that is in my url.
But how can I add the filter: “hash-end” tho this?