[Tizen][Runtime] Fix using the wrong attribute name for hardware key setting.

In Tizen, the <tizen:setting hwkey-event="disable" /> setting could
disable the hardware key event. But the implementation use the wrong
attribute name "hwkey", need to change it to "hwkey-event" according to
Tizen core spec feature XWALK-1491.

BUG=XWALK-1611
[Runtime] Fix i18n data loss BUG when storage to db

We get manifest from file first time after application
installed, and we storage this manifest data to db, after
that we will get manifest data from db.

We parse i18n items into i18n_data_ and remove they from
data_, But we only storage data_ in db, so we can not get
i18n items after we reload the manifest data from db.
Merge pull request #1892 from takethathe/hwkey-event

[Tizen][Runtime] Fix using the wrong attribute name for hardware key setting.
Merge pull request #1893 from yeyuyinjie/fix_manifest_data

[Runtime] Fix i18n data loss BUG when storage to db