message: feat:(_app.tsx): initialize i18next instance
diff: @@ -3,11 +3,16 @@ import Head from 'next/head'
  import { AppProps } from 'next/app'
  import { ThemeProvider } from '@material-ui/core/styles'
  import CssBaseline from '@material-ui/core/CssBaseline'
  +import { useRouter } from 'next/router'
  +import { i18nextInit } from '../i18n'
  import theme from 'common/theme'
  export default function CustomApp(props: AppProps) {
  const { Component, pageProps } = props
  + const nextRouter = useRouter()
  +
  + i18nextInit(nextRouter, pageProps.i18nNamespaces)
  React.useEffect(() => {
  // Remove the server-side injected CSS.
  