Pickadate japanese language

Hi!

We are translating our website to Japanese and we are using pickadate to select dates.

We have found several errors:
- Once you open the date picker, the month and year must be written in the following format:
yyyy年m月
For example: "February 2016" has to be written as "2016年2月"
This is not possible in pickadate where the year is always written in the right side and without the possibility of adding the symbol 年.
- The word "Close" is not include in the translation file. "Close" is translated to japanese as "閉じる".

I have added the translation of "close" to my code, but I don't know how to fix the first error without changing the core script.

Thanks in advance and sorry for the possible inconvenience.