incubator-cordova-js pull request: CB-1473

[Marcel Kinard]

I submitted a pull request on github about 4 hours ago, but I haven't 
seen an autogenerated email land on the dev list yet, so here's a manual 
email.

https://github.com/apache/incubator-cordova-js/pull/29
Added missing comments to getPreferredLanguage(). Part of CB-1473.