Incorporate language detection 'confidence' level?

[rnackman]

The Translate API returns a confidence level from 0 to 1 and a Boolean isReliable. Looks like if there's no completely confident result, it's not considered reliable, and the API lists a set of alternate language suggestions in descending order of confidence.

I'm working on pulling in confidence and the second language suggestion. We can see if this allows us to catch translations that are bad because of poor language detection. Maybe allow users to indicate whether they think the language has been detected properly?