feat(resume): add label text to PDF download button

- Button now shows icon + 'Скачать в PDF' text
- Add fab--label modifier for auto-width with padding
- Add fab-primary__label for text styling

src/partials/fab-stack-resume.html

@@ -1,6 +1,7 @@
 <div class="fab-stack" aria-label="Быстрые действия">
-      <button type="button" class="fab fab--primary" data-resume-pdf-btn aria-label="Скачать резюме в PDF">
+      <button type="button" class="fab fab--primary fab--label" data-resume-pdf-btn aria-label="Скачать резюме в PDF">
         <span class="fab-primary__ico fab-primary__ico--pdf" aria-hidden="true"></span>
+        <span class="fab-primary__label">Скачать в PDF</span>
         <span class="fab-primary__spinner" aria-hidden="true"></span>
       </button>
     </div>