Rephrase fixedtoolbar setting

Thanks Xander for the suggestion!

Change-Id: Icb2bd9fe3ef1bb73cc1948eda37a09d81c9c7449
diff --git a/src/static/_locales/en/messages.json b/src/static/_locales/en/messages.json
index 7f6b213..b55cc98 100644
--- a/src/static/_locales/en/messages.json
+++ b/src/static/_locales/en/messages.json
@@ -56,7 +56,7 @@
     "description": "Feature checkbox in the options page"
   },
   "options_fixedtoolbar": {
-    "message": "Fix the toolbar in thread lists in the Community Console.",
+    "message": "Make the toolbar stick at the top of thread lists in the Community Console.",
     "description": "Feature checkbox in the options page"
   },
   "options_redirect": {