Internationalization + Finnish language (#181)

* I18n with next-intl

* package-lock

* Finnish translations

* Development fix

* Use locale for positioning currency symbol

* Translations: Expenses.ActiveUserModal

* Translations: group 404

* Better translation for ExpenseCard

* Apply translations in CategorySelect search

* Fix for Finnish translation

* Translations for ExpenseDocumentsInput

* Translations for CreateFromReceipt

* Fix for Finnish translation

* Translations for schema errors

* Fix for Finnish translation

* Fixes for Finnish translations

* Prettier

---------

Co-authored-by: Sebastien Castiel <sebastien@castiel.me>

src/lib/utils.ts

@@ -15,9 +15,10 @@ export type DateTimeStyle = NonNullable<
 >['dateStyle']
 export function formatDate(
   date: Date,
+  locale: string,
   options: { dateStyle?: DateTimeStyle; timeStyle?: DateTimeStyle } = {},
 ) {
-  return date.toLocaleString('en-GB', {
+  return date.toLocaleString(locale, {
     ...options,
     timeZone: 'UTC',
   })
@@ -27,18 +28,25 @@ export function formatCategoryForAIPrompt(category: Category) {
   return `"${category.grouping}/${category.name}" (ID: ${category.id})`
 }
 
-export function formatCurrency(currency: string, amount: number) {
-  const format = new Intl.NumberFormat('en-US', {
+export function formatCurrency(
+  currency: string,
+  amount: number,
+  locale: string,
+) {
+  const format = new Intl.NumberFormat(locale, {
     minimumFractionDigits: 2,
     maximumFractionDigits: 2,
+    style: 'currency',
+    // '€' will be placed in correct position
+    currency: 'EUR',
   })
   const formattedAmount = format.format(amount / 100)
-  return `${currency} ${formattedAmount}`
+  return formattedAmount.replace('€', currency)
 }
 
-export function formatFileSize(size: number) {
+export function formatFileSize(size: number, locale: string) {
   const formatNumber = (num: number) =>
-    num.toLocaleString('en-US', {
+    num.toLocaleString(locale, {
       minimumFractionDigits: 0,
       maximumFractionDigits: 1,
     })