Added i18n mechanism and locale file of Japanese.

You can change the value of "title", "text" or "name" property by chrome i18n message catalog.

ex)
title:
'About App Inspector for Sencha'
to
'App Inspector for Sencha について'

It allows the message key which contains space value. If doesn't exist a message in the catalog, use it just as it is.
Add my name to the contributors list. I'm honored :)
Added some messages that were overlooked.

- Utility to find components which may be overnested inside the application.
- Utility to find nested box layouts inside the application which may contribute to performance issues.
Merge pull request #46 from kawanoshinobu/pullreq

Added i18n mechanism and locale file of Japanese.