feat(i18n): Aktionsleiste + Sidebar (Quellen, Feedback, Archiv, Stats, Empty-States)

- 5 Action-Buttons im Header (Aktualisieren/Bearbeiten/Bericht
  exportieren/Archivieren/Loeschen) via data-i18n.
- Sidebar Archiv-Section, Quellen-Button, Feedback-Button, title-
  Attribute via data-i18n + data-i18n-attr.
- Sidebar-Stats 0 Quellen / 0 Artikel: app.js.updateSidebarStats
  baut die Suffixe ueber T() zusammen.
- Empty-States Kein Live-Monitoring / Keine Deep-Research (inkl.
  eigene-Filter-Varianten) lokalisiert.
- Cache-Buster app.js auf v=20260513g.

src/static/dashboard.html

@@ -117,19 +117,19 @@
             <div class="sidebar-section">
                 <h2 class="sidebar-section-title collapsible" onclick="App.toggleSidebarSection('archived-incidents')" role="button" tabindex="0" aria-expanded="false">
                     <span class="sidebar-chevron" id="chevron-archived-incidents" aria-hidden="true">&#9662;</span>
-                    Archiv
+                    <span data-i18n="sidebar.archive">Archiv</span>
                     <span class="sidebar-section-count" id="count-archived-incidents"></span>
                 </h2>
                 <div id="archived-incidents" aria-live="polite" style="display:none;"></div>
             </div>
             <div class="sidebar-sources-link">
-                <button class="btn btn-secondary btn-full btn-small" onclick="App.openSourceManagement()" title="Quellen verwalten">
+                <button class="btn btn-secondary btn-full btn-small" onclick="App.openSourceManagement()" title="Quellen verwalten" data-i18n-attr="title:sidebar.manage_sources_title">
                     <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><ellipse cx="12" cy="5" rx="9" ry="3"/><path d="M3 5v14c0 1.66 4.03 3 9 3s9-1.34 9-3V5"/><path d="M3 12c0 1.66 4.03 3 9 3s9-1.34 9-3"/></svg>
-                    <span>Quellen</span>
+                    <span data-i18n="sidebar.sources">Quellen</span>
                 </button>
-                <button class="btn btn-secondary btn-full btn-small sidebar-feedback-btn" onclick="App.openFeedback()" title="Feedback senden">
+                <button class="btn btn-secondary btn-full btn-small sidebar-feedback-btn" onclick="App.openFeedback()" title="Feedback senden" data-i18n-attr="title:sidebar.feedback_title">
                     <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect width="20" height="16" x="2" y="4" rx="2"/><path d="m22 7-10 5L2 7"/></svg>
-                    <span>Feedback</span>
+                    <span data-i18n="sidebar.feedback">Feedback</span>
                 </button>
                 <!-- Tutorial-Einstieg temporaer deaktiviert (Ueberarbeitung) - reaktivieren durch Entfernen der Kommentarzeichen:
                 <button class="btn btn-secondary btn-full btn-small" onclick="Tutorial.start()" title="Interaktiven Rundgang starten">Rundgang starten</button>
@@ -165,11 +165,11 @@
                             <h2 class="incident-header-title" id="incident-title"></h2>
                         </div>
                         <div class="incident-header-actions">
-                            <button class="btn btn-primary btn-small" id="refresh-btn">Aktualisieren</button>
-                            <button class="btn btn-secondary btn-small" id="edit-incident-btn">Bearbeiten</button>
-                            <button class="btn btn-secondary btn-small" onclick="App.openExportModal()" data-i18n="modal.export.title">Bericht exportieren</button>
-                            <button class="btn btn-secondary btn-small" id="archive-incident-btn">Archivieren</button>
-                            <button class="btn btn-danger btn-small" id="delete-incident-btn">Löschen</button>
+                            <button class="btn btn-primary btn-small" id="refresh-btn" data-i18n="action.refresh">Aktualisieren</button>
+                            <button class="btn btn-secondary btn-small" id="edit-incident-btn" data-i18n="action.edit">Bearbeiten</button>
+                            <button class="btn btn-secondary btn-small" onclick="App.openExportModal()" data-i18n="action.export">Bericht exportieren</button>
+                            <button class="btn btn-secondary btn-small" id="archive-incident-btn" data-i18n="action.archive">Archivieren</button>
+                            <button class="btn btn-danger btn-small" id="delete-incident-btn" data-i18n="action.delete">Löschen</button>
                         </div>
                     </div>
                     <div class="incident-header-row2">
@@ -729,7 +729,7 @@
     <script src="/static/js/components.js?v=20260513d"></script>
     <script src="/static/js/layout.js?v=20260513f"></script>
     <script src="/static/js/pipeline.js?v=20260513d"></script>
-    <script src="/static/js/app.js?v=20260513f"></script>
+    <script src="/static/js/app.js?v=20260513g"></script>
     <script src="/static/js/cluster-data.js?v=20260322f"></script>
     <script src="/static/js/tutorial.js?v=20260316z"></script>
     <script src="/static/js/chat.js?v=20260422a"></script>