PlasmaCore.DataSource cannot get data if the key is in japanese character

[Reza Shah]

Hi Marco,

As i talked in #plasma.
I don't have problem in plasmaengineexplorer when querying kitenengine
using english word and japanese word.

The problem only happened when i'm using
dataSource[japaneseWord]['text'] in kitenqml plasmoid.

Here are my scratch repo for kitenengine and kitenqml plasmoid:
git at git.kde.org:scratch/rshah/kitenengine.git
git at git.kde.org:scratch/rshah/kitenqml.git