refactor: use de gruyter ci

frontend/static/degruyter-icons/Simple/Small-16px/SVG/Action/Download/Download-PDF-SM.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="48px" height="16px" viewBox="0 0 48 16" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>🧩 Icons/Simple/Action/16px/Download/Download-PDF-SM</title>
+    <g id="🧩-Icons/Simple/Action/16px/Download/Download-PDF-SM" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="Icon-Group" transform="translate(1.000000, 0.000000)" fill="#000000">
+            <g id="Primary" transform="translate(30.000000, 0.000000)">
+                <path d="M15,14 L15,16 L1,16 L1,14 L15,14 Z M10,0 L10,6 L15,6 L8.01565996,12 L1,6 L6,6 L6,0 L10,0 Z"></path>
+            </g>
+            <path d="M1.722,12.8 L1.722,9.65 L3.668,9.65 C5.824,9.65 7.588,8.502 7.588,6.304 L7.588,6.276 C7.588,4.302 6.16,3 3.864,3 L-6.57252031e-14,3 L-6.57252031e-14,12.8 L1.722,12.8 Z M3.724,8.096 L1.722,8.096 L1.722,4.568 L3.724,4.568 C5.012,4.568 5.838,5.17 5.838,6.318 L5.838,6.346 C5.838,7.368 5.026,8.096 3.724,8.096 Z M12.808353,12.8 C15.888353,12.8 18.016353,10.658 18.016353,7.9 L18.016353,7.872 C18.016353,5.114 15.888353,3 12.808353,3 L9.154353,3 L9.154353,12.8 L12.808353,12.8 Z M12.808353,11.232 L10.876353,11.232 L10.876353,4.568 L12.808353,4.568 C14.866353,4.568 16.210353,5.982 16.210353,7.9 L16.210353,7.928 C16.210353,9.846 14.866353,11.232 12.808353,11.232 Z M21.626706,12.8 L21.626706,8.81 L26.568706,8.81 L26.568706,7.242 L21.626706,7.242 L21.626706,4.568 L27.198706,4.568 L27.198706,3 L19.904706,3 L19.904706,12.8 L21.626706,12.8 Z" id="Primary"></path>
+        </g>
+    </g>
+</svg>