Including Missing translation for pt-br

Added line for "CMD_OPEN_PREFERENCES" in Brazilian Portuguese language.
Fixed bug with PromiseQueue instances sharing same queue.

Fixed issue with Async.PromiseQueue instances sharing the same queue in the prototype.
Fix is to define _queue and _curPromise in the constructor.
Added to Async-test to test for this case.
Adjustments for better understanding.
Applied nitpicks in PromiseQueue shared queue fix.

Set PromiseQueue.prototype._queue to null to avoid confusion.
Removed unneeded _curPromise initialization in constructor.

Signed-off-by: jayther <jayther@gmail.com>
Updated by ALF automation.
Merge pull request #7506 from adobe/alf_localization

ALF Automation
Merge pull request #7470 from Rynaro/master

Including Missing translation for pt-br (pt-br string.js)
Merge pull request #7485 from jayther/promisequeuesharefix

Fixed bug with PromiseQueue instances sharing same queue.