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Produce unique message ids in a format component.id (e.g. home.welcome or carousel.title) in <FormattedMessage id="<ID>" defaultMessage=<ENGLISH LINE AS IT WAS BEFORE>/>
Some things require a bit more work, see examples. This is when a line includes some parts which do no need to be translated (like tags or links, example 2) Or where a property of another component needs to be translated (like alt of an img, example3)
You should not add anything to intl/en.json file - this will be done automatically. If you want to test this locally - you need to run
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