How to change default titles on a .qmd document?

I am composing a report in Spanish using Quarto (a .qmd document intended for publication as HTML) in Rstudio. When preparing the YAML, I include the following:

---
title: "Avance de proyecto - 2025"
subtitle: "Presentación y análisis de los resultados preliminares"
author:
  - name: "Pedro Páramo"
    affiliation: "Universidad Rulfo"
    roles:
      - "Investigador Asociado"
lang: es
---

And the rendered HTML produces the attached image. I want to change the 'Autor/A' default title in Spanish to: 'Por:' ("by", in English) and 'Afiliación' to "Institución" and include the role of the author. Can anyone help me? I've tried creating a _locale/es.yml file, adding more code to the .qmd YAML, and several other approaches, but nothing has worked.

Author and affiliation can be translated directly via the language key:

language: 
  title-block-author-single: "Por"
  title-block-affiliation-single: "Institución"

Including the role requires on the other hand more work. You can use template-partials and modify title-metadata.html where the relevant part is

$for(by-author)$
<div>
  <div class="quarto-title-meta-heading">$language.title-block-role-single$</div>
  <div class="quarto-title-meta-contents">
    $for(by-author.roles)$
    <p class="role">
      $it.role$
    </p>
    $endfor$
  </div>
</div>
$endfor$

It adds the role with a heading defined in language by

language: 
  title-block-role-single: "Papel"

where

author:
  - name: "Pedro Páramo"
    affiliation: "Universidad Rulfo"
    roles:
      - "Investigador Asociado"

index.qmd

---
title: "Avance de proyecto - 2025"
subtitle: "Presentación y análisis de los resultados preliminares"
author:
  - name: "Pedro Páramo"
    affiliation: "Universidad Rulfo"
    roles:
      - "Investigador Asociado"
lang: es
language: 
  title-block-author-single: "Por"
  title-block-affiliation-single: "Institución"
  title-block-role-single: "Papel"
template-partials:
  - title-metadata.html
---

title-metadata.html

<div class="quarto-title-meta-container">
  <div class="quarto-title-meta-column-start">
    $if(by-affiliation/first)$
    <div class="quarto-title-meta-author">
      <div class="quarto-title-meta-heading">$labels.authors$</div>
      <div class="quarto-title-meta-heading">$labels.affiliations$</div>
      
      $for(by-author)$
      <div class="quarto-title-meta-contents">
        <p class="author">$_title-meta-author.html()$</p>
      </div>
      $if(by-author.affiliations)$
      <div class="quarto-title-meta-contents">
        $for(by-author.affiliations)$
        <p class="affiliation">
          $if(it.url)$
          <a href="$it.url$">
          $endif$
          $it.name$
          $if(it.url)$
          </a>
          $endif$
        </p>
        $endfor$
      </div>
      $endif$
      $endfor$
    </div>
    $endif$

    <div class="quarto-title-meta">

      $if(by-affiliation)$
      $elseif(by-author)$
      <div>
        <div class="quarto-title-meta-heading">$labels.authors$</div>
        <div class="quarto-title-meta-contents">
          $for(by-author)$
          <p>$_title-meta-author.html()$</p>
          $endfor$
        </div>
      </div>
      $endif$
      
      $if(date)$
      <div>
        <div class="quarto-title-meta-heading">$labels.published$</div>
        <div class="quarto-title-meta-contents">
          <p class="date">$date$</p>
        </div>
      </div>
      $endif$

      $if(date-modified)$
      <div>
        <div class="quarto-title-meta-heading">$labels.modified$</div>
        <div class="quarto-title-meta-contents">
          <p class="date-modified">$date-modified$</p>
        </div>
      </div>
      $endif$
      
      $if(doi)$
      <div>
        <div class="quarto-title-meta-heading">$labels.doi$</div>
        <div class="quarto-title-meta-contents">
          <p class="doi">
            <a href="https://doi.org/$doi$">$doi$</a>
          </p>
        </div>
      </div>
      $endif$
    </div>
  </div>
  <div class="quarto-title-meta-column-end quarto-other-formats-target">
  </div>
</div>

$if(abstract)$
<div>
  <div class="abstract">
    <div class="block-title">$labels.abstract$</div>
    $abstract$
  </div>
</div>
$endif$

$if(keywords)$
<div>
  <div class="keywords">
    <div class="block-title">$labels.keywords$</div>
    <p>$for(keywords)$$it$$sep$, $endfor$</p>
  </div>
</div>
$endif$

$for(by-author)$
<div>
  <div class="quarto-title-meta-heading">$language.title-block-role-single$</div>
  <div class="quarto-title-meta-contents">
    $for(by-author.roles)$
    <p class="role">
      $it.role$
    </p>
    $endfor$
  </div>
</div>
$endfor$

<div class="quarto-other-links-text-target">
</div>