[Feature] Wrap all text in react-intl for localization

[ghost]

To be able to translate the application, all text has to be wrapped in <FormattedMessage> or formatMessage. We may have to rethink the way we define messages to avoid problems with extraction. I suspect explicitly calling defineMessage for all text centrally in each component is cleaner than defining the text on use, particularly since we can't always use <FormattedMessage>.