Added QChart::locale property...
Added QChart::locale property
This locale is used for localizing the numbers on various labels when
localizeNumbers is set to true. It is also the locale that
QDateTimeAxis labels use for month and day names.
Task-number: QTRD-3179
Change-Id: Ib9a9cad770c5a6890311fe45a1d4cabd5f40aff4
Reviewed-by: Mika Salmela <mika.salmela@digia.com>