DateFormat L10N (Task Detail view)

When setting date to task, display date e.g. "Tuesday, 15 January".
But, in Japanese, unfortunately visible it e.g. "火曜日, 15 1月".
We expect it: "1月15日 火曜日".
This pull request will fix this problem.

![patch1](https://f.cloud.github.com/assets/867470/64929/8a2274b8-5e61-11e2-8b33-74540ecb1276.png)

I think my code is not smart, and I want to know better coding.
Please tell me this solution if my pull request is not better.