feat: add localized day and month name helpers

src/i18n/index.ts

 import Polyglot from 'node-polyglot'
 import { App, computed, reactive } from 'vue'
+
 import { has } from '@/utilities'
+import { range } from 'lodash'
+import { parseISO } from 'date-fns'
 
 const STORAGE_KEY = 'aura:locale'
 
@@ -57,6 +60,28 @@ export function getLanguageName(languageCode: string) {
   return new Intl.DisplayNames([languageCode], { type: 'language' }).of(languageCode)
 }
 
+/**
+ * Returns a list of weekday names starting on monday.
+ * @param locale string
+ */
+export function getDayNames(locale: string) {
+  return range(7).map((i) =>
+    // January, 1st 2018 is a monday
+    parseISO(`2018-01-0${i + 1}`).toLocaleString(locale, { weekday: 'long' }),
+  )
+}
+
+export function getMonthNames(locale: string) {
+  return range(12).map((i) =>
+    parseISO(`2018-${(i + 1).toString().padStart(2, '0')}-01`).toLocaleString(locale, {
+      month: 'long',
+    }),
+  )
+}
+
+const dayNames = computed(() => getDayNames(locale.value))
+const monthNames = computed(() => getMonthNames(locale.value))
+
 export function useI18n() {
   // This interface is intentionally similar to the one provided by
   // Vue I18n to make it easier for newcomers already familiar with it
@@ -66,6 +91,8 @@ export function useI18n() {
     t,
     te,
     locale,
+    dayNames,
+    monthNames,
     availableLocales,
   }
 }