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This also fixes an issue when a UI event triggered a code generation,
which in turn updated a block in a way that caused a new UI event to fire
and repeat this process in a circle.

Change how Ardublockly block strings are stored and build

Fixes #162

Python 2.7 has been added by default in the Travis CI images, so no
need to reinstall it. Need to add pip, but ensure the python installation
picks the right site-packages.

Python3 brew default is 3.6, which is not compatible with PyInstaller,
so install 3.5 instead.

Look like in March DropBox has changed their download links so the
link for py2exe has been dead since.
There is also a bug in Python 2.7.13 that affects one of the
pyserial scripts, so need to install and use an older version.

The stepper motor block now offer the option to select between two and four pins. The pin number selection dropdowns are updated accordingly.

* add russian

* a little of translation

* another translation part

* small interface translation

* transl 2

* some dumb translation push

* almost done translation

* polishing translation

* small typos

* pteacher remarks + encoding issue

* small typos

* roll back changes to actions/py

* move translation to json

Italian translation

Use the formatted name for global variable declartion.

Fixes issue with spaces in variable names.