[INTERNAL] m.ComboBox: the selected item should be visible

Ensure that the selected item is visible when the picker
pop-up is opened and the user navigates via keyboard.

Change-Id: I22a21d7a2b13f131dc5117bdf7c05459a4d48762
[FIX]m.DateTimeInput: Day/Month names do not need encoding.

- Since day/month names are coming from Resource Bundle it is not
necessary to encode them.
- Global definition in toolbar is localized
- Width local variable is used for ToolbarSpacer

Change-Id: Iaad6be91beb263bb2b97155c9ce7b2b77a0939d4
Merge "[INTERNAL] m.ComboBox: the selected item should be visible"
Merge "[FIX]m.DateTimeInput: Day/Month names do not need encoding."