Add misssing Polish translations (#486)

Piotr Orzechowski

18.20.2020 3ab299fb8dc509492e5d5675fe7903768ef656b9

1
2
3
4
5
6
7
<section class="container centered">
  <div class="error">
    <h1>404</h1>
    <h2>{{ i18n "page_not_found" }}</h2>
    <p>{{ i18n "page_does_not_exist" }}<br />{{ i18n "head_back" .Site.BaseURL | safeHTML }}</p>
  </div>
</section>