feat: add missing translations across all locales

Add 692 translation keys across 21 locale files, covering admin actions, moderation, radio, catalog, and public UI strings.

src/messages/de.json

@@ -880,7 +880,8 @@
 				"tradeLog": "Trade log",
 				"tools": "Tools",
 				"guilds": "Guilds",
-				"itemsBase": "Items base"
+				"itemsBase": "Items base",
+				"adminMenu": "Admin menu"
 			},
 			"dashboard": {
 				"title": "Dashboard",
@@ -1091,7 +1092,8 @@
 				"distinctPhotographers": "Distinct photographers on this page",
 				"total": "Total photos",
 				"recentPhotos": "Recent photos",
-				"pageOf": "Page {page} of {last} · {total} total"
+				"pageOf": "Page {page} of {last} · {total} total",
+				"purgeHint": "Delete removes the database row and best-effort deletes a matching file under /public. External CDN URLs are not purged."
 			},
 			"users": {
 				"title": "Benutzer",
@@ -1973,14 +1975,24 @@
 					"typeStaff": "Nur Team",
 					"urgent": "Dringend",
 					"send": "Alarm senden",
-					"sending": "Wird gesendet…"
+					"sending": "Wird gesendet…",
+					"description": "Broadcasts via RCON <code>hotelalert</code> to online users."
 				},
 				"colId": "ID",
 				"colTitle": "Titel",
 				"colSentBy": "Gesendet von",
 				"colType": "Typ",
 				"colDate": "Datum",
-				"colActions": "Aktionen"
+				"colActions": "Aktionen",
+				"noAlerts": "No recent alerts",
+				"alertsShown": "Shown",
+				"critical": "Critical",
+				"warnings": "Warnings",
+				"unread": "Unread",
+				"markAllRead": "Mark all read",
+				"colWhen": "When",
+				"colSeverity": "Severity",
+				"colMessage": "Message"
 			},
 			"logs": {
 				"title": "Team-Aktivitäten",
@@ -2908,6 +2920,24 @@
 				"modNavInbox": "Inbox",
 				"modNavDesk": "CMS desk",
 				"modNavHelp": "Help center"
+			},
+			"menu": {
+				"title": "Admin menu",
+				"subtitle": "Reorder and hide sidebar groups and links. Routes and permissions stay in code.",
+				"save": "Save menu",
+				"saving": "Saving…",
+				"saved": "Admin menu saved.",
+				"saveFailed": "Could not save admin menu.",
+				"reset": "Reset to default",
+				"viewOnly": "You can view the menu layout but need settings edit permission to change it.",
+				"hint": "Dashboard and this page stay visible. ACL still filters what each rank sees.",
+				"moveUp": "Move up",
+				"moveDown": "Move down",
+				"hideGroup": "Hide group",
+				"showGroup": "Show group",
+				"hideItem": "Hide item",
+				"showItem": "Show item",
+				"pinned": "Pinned"
 			}
 		},
 		"radioRequests": {