Merge pull request #5999 from MetaMask/app-description

Refine app description

Author: tmashuang

app/_locales/en/messages.json

@@ -102,7 +102,7 @@
     "message": "Amount + TX Fee"
   },
   "appDescription": {
-    "message": "Ethereum Browser Extension",
+    "message": "An Ethereum Wallet in your Browser",
     "description": "The description of the application"
   },
   "appName": {