Allow fields of i18n to have optional translation

[hetd54]

Users of our site would like to set up everything in english and then hire translators for various locales.
Setting a locale causes each field to be required for each locale upon creation of a post (see here if we have EN, ES, and PT):

However, setting up a locale for only EN results in an error stating that a minimum of two values must be declared in the i18n locales.

Could we have an option to make the locale's fields optional or allow a minimum of one locale?