Support newline in javascript translates

[stevenvdp]

Currently it's not possible to add translates in js-translation.json if you use a newline after the opening brackets of the translate helper function in your templates.

This pull requests adds support for the following cases:

$.mage.__(
    'This is a string'
);
$.mage.__(
    "This is a string"
);

$t(
    "This is a string"
);
$t(
    'This is a string'
);

[daim2k5]

Thank you for your contribution. Please accept the contributors license agreement so this PR can be further processed. This can be done by clicking the "Details" link next to the "license/cla" check below.

[stevenvdp]

I added the email address used in the commit in my Github account, the CLA is now marked correctly

[okorshenko]

Internal ticket: MAGETWO-52573

[okorshenko]

@stevenvdp Thank you for contribution. Your Pull Request merged to develop branch.