Add translations (#562)

Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/562
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

src/helpers/time/formatDate.js

@@ -0,0 +1,40 @@
+import {createDateFromString} from '@/helpers/time/createDateFromString'
+import {format, formatDistance} from 'date-fns'
+import { enGB, de } from 'date-fns/locale'
+
+const locales = {enGB, de}
+
+const dateIsValid = date => {
+	if (date === null) {
+		return false
+	}
+
+	return date instanceof Date && !isNaN(date)
+}
+
+export const formatDate = (date, f, locale) => {
+	if (!dateIsValid(date)) {
+		return ''
+	}
+
+	date = createDateFromString(date)
+
+	return date ? format(date, f, {locale: locales[locale]}) : ''
+}
+
+export const formatDateSince = (date, $t) => {
+	if (!dateIsValid(date)) {
+		return ''
+	}
+
+	date = createDateFromString(date)
+
+	const currentDate = new Date()
+	const distance = formatDistance(date, currentDate)
+
+	if (date > currentDate) {
+		return $t('date.in', {date: distance})
+	}
+
+	return $t('date.ago', {date: distance})
+}