refactor: use de gruyter ci

frontend/static/degruyter-icons/Simple/Large-32px/SVG/Action/Video-Audio/Video-Audio-Back-15-LG.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32px" height="32px" viewBox="0 0 32 32" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>🧩 Icons/Simple/Action/32px/Video-Audio/Video-Audio-Back-15-LG</title>
+    <g id="🧩-Icons/Simple/Action/32px/Video-Audio/Video-Audio-Back-15-LG" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <path d="M16.4797364,18.083682 L16.4797364,19.9079498 L11.2267529,19.9079498 L11.0421432,22.6527197 C11.5959722,22.4518828 12.1162357,22.3179916 12.9050224,22.3179916 C15.1874689,22.3179916 17,23.5230126 17,26 L17,26 L17,26.0334728 C17,28.4267782 15.237817,30 12.6364993,30 C10.8407509,30 9.43100448,29.2803347 8.32334659,28.209205 L8.32334659,28.209205 L9.59883143,26.7196653 C10.5386624,27.5899582 11.5288414,28.125523 12.6197166,28.125523 C14.029463,28.125523 14.9525112,27.3221757 14.9525112,26.1004184 L14.9525112,26.1004184 L14.9525112,26.0669456 C14.9525112,24.8786611 13.9455495,24.125523 12.5190204,24.125523 C11.6798856,24.125523 10.9582297,24.3598326 10.3540527,24.6443515 L10.3540527,24.6443515 L9.11213327,23.8242678 L9.44778717,18.083682 L16.4797364,18.083682 Z M6.59845848,18 L6.59845848,29.7991632 L4.55096967,29.7991632 L4.55096967,20.0920502 L2.43635007,20.6778243 L2,19.0041841 L5.17192939,18 L6.59845848,18 Z M10,2 L10,7 L30,7 L30,25 L20,25 L20,23 L28,23 L28,9 L10,9 L10,14 L2,8 L10,2 Z" id="Primary" fill="#000000"></path>
+    </g>
+</svg>