add support for locale interrogation

[pixelzoom]

We'd like to know:
• language code
• country code
• direction (LTR vs RTL)

The direction is needed to support locale-specific layout.

[pixelzoom]

Related to phetsims/scenery#429 and phetsims/joist#152, so assigning to @jonathanolson.

[pixelzoom]

Related to translation, so labeling with "Summer 2015 redeploy".

[jonathanolson]

As noted in last developer meeting, the tentative plan is to not have direction known. So I presume this issue is about parsing phet.joist.sim.locale into the language and optional country code?

[samreid]

As noted in last developer meeting, the tentative plan is to not have direction known

I missed this meeting and didn't hear any context about this decision. Does this mean we are deciding not to ever customize the layout for RTL vs LTR languages?

[jonathanolson]

It's more of a "we'll add global direction information if/when do the first custom RTL layout", as it was noted as low priority.