Update laravel/documentation/localization.md

Updated to use the two-letter, ISO standard language code for Spanish--'es' instead of 'sp'.
Add JSONP as a default response.
Add documentation for JSONP Response
Added callback wrapper for JSONP auto wrapping.
Add semi-colon onto padding to be safe.
Merge pull request #1501 from JesseObrien/master

Add Response::jsonp() to Response class.
Merge pull request #1415 from j20/patch-1

Update laravel/documentation/localization.md
Merge branch 'master' into develop