Calendar: Add the delete events menu item for landscape.

Add the menu item for "Delete event" in the landscape menu layout.

CRs-Fixed: 630737

Change-Id: Ic5b093085a92994ef61000cb6a828ae048fd3cec
Modified file action_mode.xml

action_mode.xml with the changes. Copyright updated.
Temporarily disabled use of dropdown icon till it is merged.

Change-Id: Idd40cde01b9487fdea11823886def1cf416df08f
Calendar: Add the strings of "Delete events" for Chinese language.

CRs-Fixed: 630165

Change-Id: I2ff5eef756d21f1b32d4e4425149f0db85fc7370