Merge pull request #6 from MMSequeira/master

Updated Portuguese l10n to include stage pics and zoom strings. Also improved direction dropdown.
Portuguese translation update

Thanks, for the quick translation, Manuel!
Boolean value representation translation fix

Boolean value block representations in evaluation bubbles, speech
bubbles and stage watchers, are now translated. Thanks, Victor, for the
bug report!
Spanish translation

thanks for the contribution, Victor Manuel Muratalla!!
Simplified Chinese translation update

thanks for the contribution, 邓江华 !!
Japanese translations update

thanks to Kazuhiro Abe!!
Project Sharing / Unsharing Support (frontend)

Support for publishing and un-publishing projects in the cloud (not yet
live in the current production version of the cloud backend)
Anchored Comments Enhancements

* the Block Editor now allows anchored comments,
* duplicating a block / script / sprite now also duplicates anchored
comments,
* deleting a block / script now also deletes anchored comments
Fix: Removed added textarea from YPR module

No more text area in upper left corner of the Snap! IDE when converting
a .ypr project
PrototypeHatBlocks accept anchored comments

You can now "stick" comments to the prototype hat block in the block
editor
Loading shared cloud projects in presentation mode

and exporting URLs for shared projects
Display Custom Block Comments as Help

Selecting "Help" for a custom block now pops up the comment attached to
its definition's prototype hat, if any
Fix: Make Comments Detachable from Prototype Hats
Variable-names drop-down menu when renaming blobs

renaming variable blobs now features a drop-down menu in the dialog box
with reachable variable names and a picture of the block to be renamed