Translate the dashboard to English; euro instead of lira

Dashboard: every label, empty state, chart legend and the login page
are English; numbers and dates use en-GB (24-hour clock, day-month
dates), money is EUR, percentages read 80% instead of %80, durations
"2 h 05 min". html lang is en. Server version 1.1.2; manifests pin it.

Car app: the charging tab's price suffix, validation message and total
cost use € instead of ₺.

Checked by rendering all three pages from the 1.1.2 image against
InfluxDB 2.7.12 in podman.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

web/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "nilsmg4-web",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "nilsmg4-web",
-      "version": "1.1.1",
+      "version": "1.1.2",
       "dependencies": {
         "@influxdata/influxdb-client": "^1.35.0",
         "next": "^15.5.4",