Merge pull request #295 from nanan9177/tutorial

New Artist 4
release 0.0.64
release 0.0.64
Translations
Remove mobile checks for sound, leave it to blockly-core.
New blockly drop with sound changes.
New core drop.
Merge pull request #296 from tobyk100/sound

Sound
Merge branch 'master' into tutorial
Updated Turtle Level 4_6 so that it does not allow bigger mistakes.