Change the comment icon to something more visually appealing

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

core/img/actions/comment.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" height="16" width="16" version="1.1" viewbox="0 0 16 16"><path d="M8 1.5C3.582 1.5 0 3.962 0 7s3.582 5.5 8 5.5c.25 0 .49-.016.734-.03L13 16v-4.703c1.83-1.008 3-2.56 3-4.297 0-3.038-3.582-5.5-8-5.5z"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" height="16" width="16" viewBox="0 0 32 32"><path d="M6.667 4C4.089 4 2 6.105 2 8.7v11.282c0 2.597 2.09 4.701 4.667 4.701 1.716.01 12.083.003 17.057 0 1.115.842 1.807 1.748 3.057 3.206a.93.93 0 0 0 .561.103.969.969 0 0 0 .445-.187c.302-.223.466-.603.427-.988l-.314-2.912a4.699 4.699 0 0 0 2.1-3.923V8.701C30 6.105 27.91 4 25.333 4zm3.733 8.461c1.03 0 1.867.842 1.867 1.88 0 1.676-2.01 2.514-3.187 1.33-1.176-1.184-.343-3.21 1.32-3.21zm5.6 0c1.03 0 1.867.842 1.867 1.88 0 1.676-2.01 2.514-3.187 1.33-1.176-1.184-.343-3.21 1.32-3.21zm5.6 0c1.03 0 1.867.842 1.867 1.88 0 1.676-2.01 2.514-3.187 1.33-1.176-1.184-.343-3.21 1.32-3.21z"/></svg>