we would have to repeat the same pair in the frontmatter of both pages. This is not ideal because if we want to change the <code class="language-plaintext highlighter-rouge">subtitle</code> we would have to change it in two places. This is where localized data comes in. You can create a file like <code class="language-plaintext highlighter-rouge">_data/:lang/strings.yml</code>, one for each language, and Polyglot will bring those keys under <code class="language-plaintext highlighter-rouge">site.data[:lang]