Add translations support to start and publish commands

[darrenbelding]

What? Why?

This PR adds translation support to allow for the publishing of translatable widgets and report invalid schema feedback in a development environment. This issue was reported here: #90

Testing / Proof

A test environment is available on the test-translation-support branch of the Space48 fork containing 2 examples of widgets: with-translations and without-translations.

The start command has been tested under the following conditions:

• With a widget containing a schema_translations.json
• With a widget that does not contain a schema_translations.json
• With an invalid schema_translations.json and then correcting the invalid schema (for the purposes of dev reload)

The publish command has been tested under the following conditions:

• With a widget containing a schema_translations.json
• With a widget that does not contain a schema_translations.json