Parse given translate-values

This enable to separate scope data from translation data without
using the controller as this is a view-related task
Watch parent scope for change if we got interpolationsParams

In order to keep the view updated when data passed through
interpolationParams changes, keep a watch on parent scope.
This is particulary necessary when the data is a promise which
will get updated as the request completes
Add unit testing for added behaviors
Merge pull request #208 from Aestek/feature/parsed-translate-values

Parse given translate-values