title: Svelte-i18n with Snowpack shows blank page without errors
body: <p>I am using Svelte 3 + Snowpack 3 + Routify + Svelte-i18n. <strong>I am not using Sapper.</strong>
  I installed everything with <a href="https://github.com/rodabt/yastpack" rel="nofollow noreferrer">this template</a>. And this is <a href="https://github.com/ulvidamirli/my-svelte-i18n-snowpack-build" rel="nofollow noreferrer">my repo</a> where you can see all my files.</p>
  <p>I am following <a href="https://github.com/kaisermann/svelte-i18n/blob/main/docs/Getting%20Started.md" rel="nofollow noreferrer">the official tutorial</a> of svelte-i18n.</p>
  <p>Problem: I can't translate my page with their tutorial. I want it to work async because I will have lots of translations for lots of pages.</p>
  <p>But when I use this script in my <code>.svelte</code> file it just works:</p>
  <pre><code>import { _ } from 'svelte-i18n';
  import { addMessages, init } from &quot;svelte-i18n&quot;;
  
  import en from &quot;./lang/en.json&quot;;
  import az from &quot;./lang/az.json&quot;;
  
  addMessages(&quot;en&quot;, en);
  addMessages(&quot;az&quot;, az);
  
  init({
      initialLocale: &quot;az&quot;,
  });
  </code></pre>
  <p>When I delete it and use only this as they suggest, I get a blank screen without any error:</p>
  <pre><code>import { _ } from 'svelte-i18n';
  </code></pre>
  <p>Everything other than that is exactly the same as the tutorial. I suspect the source of reason in <code>_layout.svelte</code> file as  I don't know what is that for. And as my researches, it is something related to Sapper. I don't know if Snowpack uses it but maybe I need to make some changes to make it work with Snowpack. Also, it looks like the tutorial is written Sapper in mind as they call its name several times.</p>