Add title attribute to header actions

- Add title attrbute to refresh and avatar icons in app
  header.

Signed-off-by: Suren Neware <sneware9@in.ibm.com>
Change-Id: I89629548ecf5141e3c168fe7b5e1a60d1f86620c
diff --git a/src/locales/en-US.json b/src/locales/en-US.json
index 830d46a..7803cac 100644
--- a/src/locales/en-US.json
+++ b/src/locales/en-US.json
@@ -81,7 +81,11 @@
     "power": "Power",
     "profileSettings": "@:appPageTitle.profileSettings",
     "refresh": "Refresh",
-    "skipToContent": "Skip to content"
+    "skipToContent": "Skip to content",
+    "titleHideNavigation": "Hide navigation",
+    "titleShowNavigation": "Show navigation",
+    "titleProfile": "Show profile menu",
+    "titleRefresh": "Refresh application data"
   },
   "appNavigation": {
     "accessControl": "Access control",