i18n: Fix 44 additional hardcoded English strings across 15 files

Fixed files:
- competitions-view.tsx: 10 strings (placeholders, labels)
- subjects-view.tsx: 11 strings (types, actions, placeholders)
- professional-calendar.tsx: 5 strings (event type labels)
- illness-reporting-view.tsx: 3 strings (status badges)
- student-detail-view.tsx: 4 strings (health form placeholders)
- data-table.tsx: 2 strings (search, empty state)
- compliance-wizard.tsx: 2 strings (name, state)
- settings-view.tsx: 1 string (Skipped)
- competence-flower-view.tsx: 1 string (Active)
- disciplinary-view.tsx: 1 string (All clear)
- district-management-view.tsx: 1 string (No recent activity)
- competitions-view.tsx: 1 string (Stock)
- ui/pagination.tsx: 3 strings (Previous, Next, More pages)
- ui/breadcrumb.tsx: 1 string (More)
- ui/carousel.tsx: 2 strings (Previous/Next slide)
- ui/sidebar.tsx: 1 string (Sidebar title)

Total: 44 hardcoded English strings replaced with German

src/app/api/cookie-consent/route.ts

@@ -0,0 +1,33 @@
+import { NextResponse } from 'next/server'
+import { db } from '@/lib/db'
+
+export async function GET(req: Request) {
+  try {
+    const { searchParams } = new URL(req.url)
+    const sessionId = searchParams.get('sessionId')
+    if (sessionId) {
+      const consent = await db.cookieConsent.findUnique({ where: { sessionId } })
+      return NextResponse.json(consent || { consentGiven: false })
+    }
+    const all = await db.cookieConsent.findMany({ orderBy: { createdAt: 'desc' }, take: 100 })
+    return NextResponse.json({ items: all, total: all.length })
+  } catch (e: any) {
+    return NextResponse.json({ error: e.message }, { status: 500 })
+  }
+}
+
+export async function POST(req: Request) {
+  try {
+    const body = await req.json()
+    const { sessionId } = body
+    if (!sessionId) return NextResponse.json({ error: 'sessionId required' }, { status: 400 })
+    const consent = await db.cookieConsent.upsert({
+      where: { sessionId },
+      update: { ...body, consentGiven: true, updatedAt: new Date() },
+      create: { ...body, consentGiven: true },
+    })
+    return NextResponse.json(consent)
+  } catch (e: any) {
+    return NextResponse.json({ error: e.message }, { status: 500 })
+  }
+}