[AETHER-1211] Allowing toggling of link labels via Alt-L

Change-Id: I772b6ee0c6c24eeb48466a96a45b44b9ee6eef50
diff --git a/web/gui/src/main/webapp/app/view/topo/topo.js b/web/gui/src/main/webapp/app/view/topo/topo.js
index 1348eec..4c87f86 100644
--- a/web/gui/src/main/webapp/app/view/topo/topo.js
+++ b/web/gui/src/main/webapp/app/view/topo/topo.js
@@ -104,6 +104,7 @@
             N: [fltr.clickAction, cycLayer],
             L: [tfs.cycleDeviceLabels, cycDev],
             'shift-L': [tfs.cycleHostLabels, cycHost],
+            'alt-L': [tfs.cycleLinkLabels, quiet],
 
             U: [tfs.unpin, unpin],
             R: [resetZoom, rzoom],