Show a hint when the user selects the typed word from the suggestion list.

Make it easy to add new words by tapping the word again.
Also, a small unbundling fix for vibration duration.
diff --git a/res/values/strings.xml b/res/values/strings.xml
index a19aa3b..2ac48a6 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -316,4 +316,7 @@
     <string name="language_selection_title">Select input languages</string>
     <!-- Title summary for input language selection screen -->
     <string name="language_selection_summary">Slide your finger across the spacebar to switch</string>
+    
+    <!-- Add to dictionary hint -->
+    <string name="hint_add_to_dictionary">\u2190 Tap again to save</string>
 </resources>