Support returning 'string' type for customized interpolation (#794)
Support returning 'string' type for customized interpolation (#794)

Signed-off-by: Sihyeon Jang <d9059a385588107b75c314ff257f0b950d6beff5@gmail.com>
kazupon/vue-i18n,kazupon/vue-i18n,kazupon/vue-i18n,kazupon/vue-i18n