Declensions years [склонения лет: js]. Use i18n

locale.js

export default {
  author: {
    name: 'User name',
  },
  pages: {
    index: {
      title: 'Home',
      sections: {
        about: {
          message:
            'My name is {author}. Already {years} am ...
        },
      },
    },
  },
}

page.vue

<template lang="pug">
  p {{ $t("pages.index.sections.about.message", { author: $t("author.name"), years: declensions(years, localeWords) }) }}
</template>

<script>
export default {
  data() {
    return {
      years: 5,
    }
  },
  computed: {
    localeWords() {
      if (this.$i18n.locale === 'ru') {
        return ['год', 'года', 'лет']
      } else if (this.$i18n.locale === 'en') {
        return ['year', 'years', 'years']
      }

      return []
    },
  },
  methods: {
    declensions(number, words) {
      return (
        this.years +
        ' ' +
        words[
          number % 100 > 4 && number % 100 < 20
            ? 2
            : [2, 0, 1, 1, 1, 2][number % 10 < 5 ? Math.abs(number) % 10 : 5]
        ]
      )
    },