Updated Japanese translation

Dear Developer of Android Firewall

I am Hiroki Ogawa Japanese translator of Droidwall.
Thank you for continuing to develop the Android Firewall.
I am using your app since I found it.

I'd like to modify my Japanese translation and some new words in the (res/values-ja/strings.xml).
but I don't know how to use Github!!
I've already modified a Japanese translation file and send it now.
So please let me know if you can't get my translation file.

Best regards
Hiroki Ogawa