Fix for #12081: missing translations in the js-translations.json

[mattijv]

Description

This PR adds an additional pattern to the module responsible for generating the js-translations.json file. The translation routine doesn't translate strings in tags like<translate args="This won't be translated".

This is related to (but doesn't fix) #13471 where the Html parser of the phrase collection module is also missing a pattern matching the <translate args= tags.

Fixed Issues (if relevant)

1. Magento 2.2.0: Translations for 'Item in Cart' missing in mini cart. #12081: Magento 2.2.0: Translations for 'Item in Cart' missing in mini cart.

Manual testing scenarios

1. Clean Magento installation with a translation file translating the string "Item in Cart" from Magento_Checkout.
2. Run setup:static-content:deploy
3. Without the fix, the string isn't in the generated js-translations.json file. With the fix it will be.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

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