Rename Events to "Special dates"

    <!-- Header that expands to list all event types when editing an event of a contact

         [CHAR LIMIT=20] -->

    <string name="eventLabelsGroup">Events</string>

    <string name="eventLabelsGroup">Special dates</string>

    <!-- Generic action string for text messaging a contact. Used by AccessibilityService to

         announce the purpose of the view. [CHAR LIMIT=NONE] -->