Add possibility to define icons for plugin-buttons

Change-Id: I4a30fa72953ae6136d5c5056c992bdadac135ffe
diff --git a/dev/scss/main/resultinfo.scss b/dev/scss/main/resultinfo.scss
index 67b4157..5556239 100644
--- a/dev/scss/main/resultinfo.scss
+++ b/dev/scss/main/resultinfo.scss
@@ -98,6 +98,9 @@
 
 // Define icons for result buttons
 .button-icon {
+
+  // TODO:
+  //   Add icon via data-icon
   &.align.left::after {
     content: $fa-left-align;
   }