Allow resource deep objects

[draco1989]

Description

The app-localize-behavior should allow to read deep JSON translation resources.

Expected outcome

Function .localize('my.deep.translation.greeting') should output a string

Actual outcome

The translation is not found.

Live Demo

Example: https://jsbin.com/nehajuconu/1/edit?html,output

Steps to reproduce

1. Create a component with Polymer.AppLocalizeBehavior
2. Supply a translation resource like {'en': {'my': {'greeting': 'hello_deep'}}}
3. Try to translate {{localize('my.greeting')}}
4. Should output hello_deep

Browsers Affected

• [x] Chrome
• [x] Firefox
• [x] Safari 9
• [x] Safari 8
• [x] Safari 7
• [x] Edge
• [x] IE 11
• [x] IE 10

[garcianavalon]

+1 this is required for any complex translation object

[galanovnick]

+1 would be really greate to have this feature