fix: Add de-AT locale (#515)

Author: mariomc

src/locale/de-at.js

@@ -0,0 +1,37 @@
+import dayjs from 'dayjs'
+
+const locale = {
+  name: 'de-at',
+  weekdays: 'Sonntag_Montag_Dienstag_Mittwoch_Donnerstag_Freitag_Samstag'.split('_'),
+  months: 'Jänner_Februar_März_April_Mai_Juni_Juli_August_September_Oktober_November_Dezember'.split('_'),
+  monthsShort: 'Jän._Feb._März_Apr._Mai_Juni_Juli_Aug._Sep._Okt._Nov._Dez.'.split('_'),
+  ordinal: n => `${n}.`,
+  weekStart: 1,
+  formats: {
+    LTS: 'HH:mm:ss',
+    LT: 'HH:mm',
+    L: 'DD.MM.YYYY',
+    LL: 'D. MMMM YYYY',
+    LLL: 'D. MMMM YYYY HH:mm',
+    LLLL: 'dddd, D. MMMM YYYY HH:mm'
+  },
+  relativeTime: {
+    future: 'in %s',
+    past: 'vor %s',
+    s: 'ein paar Sekunden',
+    m: 'einer Minute',
+    mm: '%d Minuten',
+    h: 'einer Stunde',
+    hh: '%d Stunden',
+    d: 'einem Tag',
+    dd: '%d Tagen',
+    M: 'einem Monat',
+    MM: '%d Monaten',
+    y: 'einem Jahr',
+    yy: '%d Jahren'
+  }
+}
+
+dayjs.locale(locale, null, true)
+
+export default locale