Add error handling for nobility advancement in NobilityView: Implemented specific error messages for cooldown and unmet requirements, enhancing user feedback during advancement attempts.

frontend/src/i18n/locales/de/falukant.json

@@ -738,7 +738,12 @@
             "advance": {
                 "confirm": "Aufsteigen beantragen"
             },
-            "cooldown": "Du kannst frühestens wieder am {date} aufsteigen."
+            "cooldown": "Du kannst frühestens wieder am {date} aufsteigen.",
+            "errors": {
+                "tooSoon": "Aufstieg zu früh.",
+                "unmet": "Folgende Voraussetzungen fehlen:",
+                "generic": "Der Aufstieg ist fehlgeschlagen."
+            }
         },
         "reputation": {
             "title": "Reputation",

frontend/src/i18n/locales/en/falukant.json

@@ -196,7 +196,12 @@
             }
         },
         "nobility": {
-            "cooldown": "You can only advance again on {date}."
+            "cooldown": "You can only advance again on {date}.",
+            "errors": {
+                "tooSoon": "Advancement too soon.",
+                "unmet": "The following requirements are not met:",
+                "generic": "Advancement failed."
+            }
     },
         "branchProduction": {
             "storageAvailable": "Free storage"