feat: add locale support for date formatting in reminders and planner routes

backend/src/routes/planner.ts

@@ -2,6 +2,7 @@ import { FastifyInstance } from "fastify";
 import nodemailer from "nodemailer";
 import { updateReminderSentTime } from "../services/reminder-scheduler.js";
 import { loadNotificationSettings, sendShoutrrrNotification } from "./settings.js";
+import { getDateLocale } from "../i18n/translations.js";
 
 type PlannerRow = {
   medicationId: number;
@@ -52,13 +53,17 @@ export async function plannerRoutes(app: FastifyInstance) {
       return reply.status(400).send({ error: "SMTP not configured" });
     }
 
+    // Get locale from settings
+    const settings = loadNotificationSettings();
+    const locale = getDateLocale(settings.language);
+
     // Format dates for display
-    const fromDate = new Date(from).toLocaleDateString("en-US", {
+    const fromDate = new Date(from).toLocaleDateString(locale, {
       year: "numeric",
       month: "long",
       day: "numeric",
     });
-    const untilDate = new Date(until).toLocaleDateString("en-US", {
+    const untilDate = new Date(until).toLocaleDateString(locale, {
       year: "numeric",
       month: "long",
       day: "numeric",

backend/src/services/intake-reminder-scheduler.ts

@@ -66,7 +66,7 @@ type UpcomingIntake = {
   pillWeightMg: number | null;
 };
 
-function getUpcomingIntakes(medName: string, slices: Slice[], minutesBefore: number, takenBy: string | null, pillWeightMg: number | null): UpcomingIntake[] {
+function getUpcomingIntakes(medName: string, slices: Slice[], minutesBefore: number, takenBy: string | null, pillWeightMg: number | null, locale: string): UpcomingIntake[] {
   const now = Date.now();
   // Window to detect if "now" is the right time to send reminder
   // We check if the notify time (intake - 15min) falls within current minute ±1
@@ -113,7 +113,7 @@ function getUpcomingIntakes(medName: string, slices: Slice[], minutesBefore: num
         medName,
         usage: slice.usage,
         intakeTime: intakeDate,
-        intakeTimeStr: intakeDate.toLocaleTimeString([], { 
+        intakeTimeStr: intakeDate.toLocaleTimeString(locale, { 
           hour: "2-digit", 
           minute: "2-digit",
           timeZone: getTimezone()
@@ -283,11 +283,12 @@ async function checkAndSendIntakeReminders(logger: { info: (msg: string) => void
 
   const state = loadIntakeReminderState();
   const allUpcoming: UpcomingIntake[] = [];
+  const locale = getDateLocale(language);
   
   // Find all upcoming intakes across all medications
   for (const med of medsWithReminders) {
     const slices = parseSlices(med);
-    const upcoming = getUpcomingIntakes(med.name, slices, REMINDER_MINUTES_BEFORE, med.takenBy, med.pillWeightMg);
+    const upcoming = getUpcomingIntakes(med.name, slices, REMINDER_MINUTES_BEFORE, med.takenBy, med.pillWeightMg, locale);
     allUpcoming.push(...upcoming);
   }