Add a new flag to `localize-translate` that allows the
source locale to be specified. When this locale is
provided an extra copy of the files is made for this
locale where the is no translation but all the calls to
`$localize` are stripped out.
Resolves FW-1623
PR Close#33101
This test uses localization in the `AppComponent` component:
* an `i18n` attribute in the template
* a call to the `$localize` tag in the component constructor
PR Close#31609
Pete Bacon Darwin
Filipe Silva