akkoma-fe/src/components/interface_language_switcher/interface_language_switcher.vue

<template>
  <div>
    <label for="interface-language-switcher">
      {{ $t('settings.interfaceLanguage') }}
    </label>
    <label
      for="interface-language-switcher"
      class="select"
    >
      <select
        id="interface-language-switcher"
        v-model="language"
      >
        <option
          v-for="(langCode, i) in languageCodes"
          :key="langCode"
          :value="langCode"
        >
          {{ languageNames[i] }}
        </option>
      </select>
      <i class="icon-down-open" />
    </label>
  </div>
</template>

<script>
import languagesObject from '../../i18n/messages'
import ISO6391 from 'iso-639-1'
import _ from 'lodash'

export default {
  computed: {
    languageCodes () {
      return Object.keys(languagesObject)
    },

    languageNames () {
      return _.map(this.languageCodes, this.getLanguageName)
    },

    language: {
      get: function () { return this.$store.getters.mergedConfig.interfaceLanguage },
      set: function (val) {
        this.$store.dispatch('setOption', { name: 'interfaceLanguage', value: val })
        this.$i18n.locale = val
      }
    }
  },

  methods: {
    getLanguageName (code) {
      const specialLanguageNames = {
        'ja': 'Japanese (やさしいにほんご)',
        'ja_pedantic': 'Japanese (日本語)',
        'zh': 'Chinese (简体中文)'
      }
      return specialLanguageNames[code] || ISO6391.getName(code)
    }
  }
}
</script>