Enhance weather model and service logic; improve money history translation handling

- Added primary key to the Weather model for better data integrity.
- Updated FalukantService to include specific weather attributes in queries, enhancing data retrieval.
- Refactored money history view to utilize a dedicated translation method for improved localization handling.

backend/models/falukant/data/weather.js

@@ -9,13 +9,13 @@ Weather.init(
   {
     regionId: {
       type: DataTypes.INTEGER,
+      primaryKey: true,
       allowNull: false,
       references: {
         model: RegionData,
         key: 'id',
         schema: 'falukant_data'
-      },
-      unique: true // Jede Stadt hat nur ein Wetter
+      }
     },
     weatherTypeId: {
       type: DataTypes.INTEGER,