feat(slideshow): en/de strings for live slideshow

Adds the slideshow.* block (transitions, color filters, watermark mode/style/
source, global defaults) and eventTypes.form.slideshowPreset labels in English
and German.

frontend/src/i18n/locales/de.json

@@ -234,6 +234,8 @@
       "slugPreview": "Beispiel-URL:",
       "emoji": "Symbol",
       "themePreset": "Standard-Theme",
+      "slideshowPreset": "Diashow-Voreinstellung",
+      "slideshowPresetHint": "Standard-Diashow-Stil für neue Events dieses Typs.",
       "isActive": "Aktiv (sichtbar bei Veranstaltungserstellung)"
     },
     "validation": {
@@ -3136,6 +3138,76 @@
       "download": "Als Datei herunterladen"
     }
   },
+  "slideshow": {
+    "adminTitle": "Live-Diashow",
+    "adminDescription": "Ein separater Vollbild-Link für Beamer bei Live-Events. Zeigt alle veröffentlichten Fotos und übernimmt neue Uploads automatisch, während die Diashow läuft.",
+    "generateLink": "Diashow-Link erstellen",
+    "linkLabel": "Diashow-Link",
+    "linkGenerated": "Diashow-Link erstellt",
+    "linkDisabled": "Diashow-Link deaktiviert",
+    "regenerate": "Neu erstellen",
+    "disable": "Deaktivieren",
+    "disableConfirm": "Diesen Diashow-Link deaktivieren? Der aktuelle Link funktioniert dann nicht mehr.",
+    "intervalLabel": "Anzeigedauer (Sek.)",
+    "transitionLabel": "Übergang",
+    "transitionSpeedLabel": "Übergangsdauer (ms)",
+    "transition": {
+      "crossfade": "Überblenden",
+      "cut": "Hart schneiden",
+      "slide": "Schieben",
+      "kenburns": "Ken Burns",
+      "dipwhite": "Über Weiß blenden",
+      "dipblack": "Über Schwarz blenden"
+    },
+    "colorfilterLabel": "Farbfilter",
+    "colorfilter": {
+      "none": "Keiner",
+      "bw": "Schwarz-Weiß",
+      "sepia": "Sepia",
+      "warm": "Warm",
+      "cool": "Kühl",
+      "vignette": "Vignette"
+    },
+    "watermarkToggle": "Logo-Wasserzeichen anzeigen",
+    "watermarkDescription": "Blendet ein weißes, halbtransparentes Logo in einer Ecke ein (wie ein Senderlogo im TV).",
+    "watermarkSourceLabel": "Logo",
+    "watermarkSource": {
+      "logo": "Helles Logo",
+      "logo_dark": "Dunkelmodus-Logo",
+      "favicon": "Favicon",
+      "event": "Event-Logo",
+      "notSet": "Nicht gesetzt"
+    },
+    "watermarkPositionLabel": "Position",
+    "watermarkPosition": {
+      "top-left": "Oben links",
+      "top-right": "Oben rechts",
+      "bottom-left": "Unten links",
+      "bottom-right": "Unten rechts"
+    },
+    "watermarkOpacityLabel": "Deckkraft (%)",
+    "watermarkStyleLabel": "Logo-Darstellung",
+    "watermarkStyle": {
+      "white": "Weiß (einfärben)",
+      "original": "Originalfarben"
+    },
+    "watermarkMode": {
+      "inherit": "Globale Vorgabe verwenden",
+      "on": "An",
+      "off": "Aus"
+    },
+    "globalTitle": "Globales Diashow-Wasserzeichen",
+    "globalDescription": "Standard-Logo-Wasserzeichen für jede Diashow. Einzelne Events können es überschreiben (an/aus).",
+    "defaultsSaved": "Diashow-Vorgaben gespeichert",
+    "liveHint": "Änderungen werden in einer laufenden Diashow innerhalb weniger Sekunden übernommen – der Link muss nicht neu erstellt werden.",
+    "saveSettings": "Diashow-Einstellungen speichern",
+    "settingsSaved": "Diashow-Einstellungen gespeichert",
+    "start": "Diashow starten",
+    "waiting": "Warte auf Fotos …",
+    "ended": "Diashow beendet.",
+    "notFound": "Dieser Diashow-Link ist nicht aktiv.",
+    "startFailed": "Diashow konnte nicht gestartet werden. Bitte erneut versuchen."
+  },
   "clientAccess": {
     "title": "Kundenzugang",
     "description": "Geben Sie Ihre PIN ein, um Fotos vor der Veröffentlichung zu überprüfen und auszuwählen.",

frontend/src/i18n/locales/en.json

@@ -2501,6 +2501,8 @@
       "slugPreview": "Example URL:",
       "emoji": "Icon",
       "themePreset": "Default Theme",
+      "slideshowPreset": "Slideshow preset",
+      "slideshowPresetHint": "Default slideshow style for new events of this type.",
       "isActive": "Active (visible in event creation)"
     },
     "validation": {
@@ -3160,6 +3162,76 @@
     "poweredBy": "Powered by PicPeak",
     "devModeHint": "Development Mode: Use email: [email protected], password: admin123"
   },
+  "slideshow": {
+    "adminTitle": "Live Slideshow",
+    "adminDescription": "A separate fullscreen link for projectors at live events. It shows all published photos and automatically picks up new uploads while running.",
+    "generateLink": "Generate slideshow link",
+    "linkLabel": "Slideshow link",
+    "linkGenerated": "Slideshow link generated",
+    "linkDisabled": "Slideshow link disabled",
+    "regenerate": "Regenerate",
+    "disable": "Disable",
+    "disableConfirm": "Disable this slideshow link? The current link will stop working.",
+    "intervalLabel": "Display time (sec)",
+    "transitionLabel": "Transition",
+    "transitionSpeedLabel": "Transition speed (ms)",
+    "transition": {
+      "crossfade": "Crossfade",
+      "cut": "Cut",
+      "slide": "Slide",
+      "kenburns": "Ken Burns",
+      "dipwhite": "Dip to white",
+      "dipblack": "Dip to black"
+    },
+    "colorfilterLabel": "Color filter",
+    "colorfilter": {
+      "none": "None",
+      "bw": "Black & White",
+      "sepia": "Sepia",
+      "warm": "Warm",
+      "cool": "Cool",
+      "vignette": "Vignette"
+    },
+    "watermarkToggle": "Show logo watermark",
+    "watermarkDescription": "Overlay a white, semi-transparent logo in a corner (like a TV station ident).",
+    "watermarkSourceLabel": "Logo",
+    "watermarkSource": {
+      "logo": "Light logo",
+      "logo_dark": "Dark-mode logo",
+      "favicon": "Favicon",
+      "event": "Event logo",
+      "notSet": "Not set"
+    },
+    "watermarkPositionLabel": "Position",
+    "watermarkPosition": {
+      "top-left": "Top left",
+      "top-right": "Top right",
+      "bottom-left": "Bottom left",
+      "bottom-right": "Bottom right"
+    },
+    "watermarkOpacityLabel": "Opacity (%)",
+    "watermarkStyleLabel": "Logo style",
+    "watermarkStyle": {
+      "white": "White (recolor)",
+      "original": "Original colors"
+    },
+    "watermarkMode": {
+      "inherit": "Use global default",
+      "on": "On",
+      "off": "Off"
+    },
+    "globalTitle": "Global slideshow watermark",
+    "globalDescription": "Default logo watermark for every slideshow. Individual events can override this on or off.",
+    "defaultsSaved": "Slideshow defaults saved",
+    "liveHint": "Changes apply to a running slideshow within a few seconds — no need to regenerate the link.",
+    "saveSettings": "Save slideshow settings",
+    "settingsSaved": "Slideshow settings saved",
+    "start": "Start slideshow",
+    "waiting": "Waiting for photos…",
+    "ended": "Slideshow ended.",
+    "notFound": "This slideshow link is not active.",
+    "startFailed": "Could not start the slideshow. Please try again."
+  },
   "clientAccess": {
     "title": "Client Access",
     "description": "Review photos and manage visibility before the gallery is shared with guests.",