Improve performance of mergeLocaleMessage (#1099) (#1101)
Improve performance of mergeLocaleMessage (#1099) (#1101)

Co-authored-by: ericlee <0269ebde567b14685047f517cf3f19c83b0eab56@openrice.com>
kazupon/vue-i18n,kazupon/vue-i18n,kazupon/vue-i18n,kazupon/vue-i18n