feat(useLocale): handle generic messages (#3100)

Co-authored-by: hywax <me@hywax.space>
Co-authored-by: Benjamin Canac <canacb1@gmail.com>

src/runtime/vue/stubs.ts

@@ -9,6 +9,7 @@ export { useHead } from '@unhead/vue'
 export { useRoute, useRouter } from 'vue-router'
 
 export { defineShortcuts } from '../composables/defineShortcuts'
+export { defineLocale } from '../composables/defineLocale'
 export { useLocale } from '../composables/useLocale'
 
 export const useColorMode = () => {