Declare a namespace's strings. Called once per app at module scope; a second call for
the same namespace merges locales, so an app may register en eagerly and another
locale when it arrives. A key is <namespace>.<name>; the namespace is an app id, the
shell's own is shell, and the SDK's primitives use ui.
Declare a namespace's strings. Called once per app at module scope; a second call for the same namespace merges locales, so an app may register
eneagerly and another locale when it arrives. A key is<namespace>.<name>; the namespace is an app id, the shell's own isshell, and the SDK's primitives useui.