Add less changes from #1950

They got lost when I dropped the commits

less/common/LoadingIndicator.less

@@ -12,3 +12,12 @@
 .LoadingIndicator--block {
   height: 100px;
 }
+
+@keyframes spinner-line-fade-default {
+  0%, 100% {
+    opacity: 0.22; /* minimum opacity */
+  }
+  1% {
+    opacity: 1;
+  }
+}