feat(falukant): enhance notification handling and localization updates

- Updated the `enrichNotificationsWithCharacterNames` method in FalukantService to include region name enrichment and handle additional character IDs.
- Introduced a new `serializeNotificationForClient` function to format notifications for the client, ensuring all relevant data is included.
- Enhanced the MessagesDialog component to merge notification payloads and extract parameters more effectively, improving the clarity of displayed messages.
- Added new localization entries for director resignation risk and regional festival effects in multiple languages, ensuring comprehensive user notifications.

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

@@ -35,7 +35,7 @@
             "notify_election_created": "A new election has been scheduled.",
             "notify_office_filled": "A political office has been filled.",
             "director": {
-                "resignation_risk_high": "High resignation risk for a director: risk {risk_percent}% (threshold {threshold_percent}%). Current satisfaction {satisfaction}."
+                "resignation_risk_high": "High resignation risk for director {directorName}: risk {risk_percent}% (threshold {threshold_percent}%). Current satisfaction {satisfaction}."
             },
             "director_death": "{characterName} died at the age of {ageYears}. As employer you need to appoint a new director.{regionLabel}{spouses}{children}{lovers}",
             "relationship_death": "{characterName} died at the age of {ageYears}.{regionLabel}{spouses}{children}{lovers}",
@@ -93,7 +93,13 @@
                 },
                 "regional_festival": {
                     "title": "Regional Festival",
-                    "description": "A large festival is taking place in the region {regionName}."
+                    "description": "A large festival is taking place in the region {regionName}.{priceEffectLine}"
+                },
+                "effects": {
+                    "price_effect_suffix": " Effect: expected goods price change ~{percent}%.",
+                    "festival_weather_line": "The regional weather shifts.",
+                    "festival_price_line": "Goods prices about {percent}%.",
+                    "festival_quality_line": "Production quality about {change}."
                 },
                 "regional_epidemic": {
                     "title": "Epidemic",