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/components/compliance-wizard.tsx

@@ -245,7 +245,7 @@ export function ComplianceWizard({ schoolId, onComplete }: ComplianceWizardProps
                   onChange={(e) =>
                     setState((prev) => ({ ...prev, dpoName: e.target.value }))
                   }
-                  placeholder="Full name"
+                  placeholder="Vollständiger Name"
                 />
               </div>
               <div>
@@ -305,7 +305,7 @@ export function ComplianceWizard({ schoolId, onComplete }: ComplianceWizardProps
                 setState((prev) => ({ ...prev, bundesland: value }))
               }>
                 <SelectTrigger>
-                  <SelectValue placeholder="Select state..." />
+                  <SelectValue placeholder="Bundesland auswählen..." />
                 </SelectTrigger>
                 <SelectContent>
                   {BUNDESLANDS.map((land) => (