Fix mixed language translation issues in results and fuel labels

Translation Fixes:
- Fixed hardcoded "/mois" showing in English interface for monthly pension loss
- Fixed hardcoded "/mo" showing regardless of language in summary section
- Fixed fuel types displaying in English instead of translated versions

Technical Implementation:
- Added translation keys for time units (units.perMonth, units.perMo)
- Created translateFuelType() helper function for consistent fuel type display
- Updated results display to use dynamic translations instead of hardcoded strings

Language Support:
- English: "/month", "/mo", "Electric"
- French: "/mois", "/mois", "Électrique"
- Dutch: "/maand", "/md", "Elektrisch"

Result: All interfaces now display consistently in the selected language
without mixed language artifacts in calculations and fuel type labels.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tax.html

@@ -948,7 +948,9 @@
                 "manual.vehicleName": "Vehicle Name",
                 "manual.listPrice": "List Price (€)",
                 "manual.co2Emissions": "CO2 Emissions (g/km)",
-                "manual.fuelType": "Fuel Type"
+                "manual.fuelType": "Fuel Type",
+                "units.perMonth": "/month",
+                "units.perMo": "/mo"
             },
             fr: {
                 title: "Calculateur d'Impôt sur les Voitures de Société",
@@ -1048,7 +1050,9 @@
                 "manual.vehicleName": "Nom du Véhicule",
                 "manual.listPrice": "Prix Catalogue (€)",
                 "manual.co2Emissions": "Émissions CO2 (g/km)",
-                "manual.fuelType": "Type de Carburant"
+                "manual.fuelType": "Type de Carburant",
+                "units.perMonth": "/mois",
+                "units.perMo": "/mois"
             },
             nl: {
                 title: "Bedrijfswagen Belasting Calculator",
@@ -1148,7 +1152,9 @@
                 "manual.vehicleName": "Voertuignaam",
                 "manual.listPrice": "Catalogusprijs (€)",
                 "manual.co2Emissions": "CO2 Uitstoot (g/km)",
-                "manual.fuelType": "Brandstoftype"
+                "manual.fuelType": "Brandstoftype",
+                "units.perMonth": "/maand",
+                "units.perMo": "/md"
             }
         };
         
@@ -1302,6 +1308,16 @@
             document.getElementById('retirement-years').value = retirementYears;
         }
         
+        function translateFuelType(fuelType) {
+            const fuelTranslations = {
+                'electric': translations[currentLanguage]['fuel.electric'] || 'Electric',
+                'petrol': translations[currentLanguage]['fuel.petrol'] || 'Petrol', 
+                'diesel': translations[currentLanguage]['fuel.diesel'] || 'Diesel',
+                'hybrid': translations[currentLanguage]['fuel.hybrid'] || 'Hybrid'
+            };
+            return fuelTranslations[fuelType] || fuelType;
+        }
+        
         // Removed switchTab function - no longer using tabs
         
         function validateRequiredFields() {
@@ -1604,14 +1620,14 @@
                 carComparisonHTML += '<div class="car-subtitle">' + car.examples + '</div>';
                 carComparisonHTML += '<div class="car-details">';
                 carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].listPrice + '</span><span class="detail-value">€' + car.price.toLocaleString() + '</span></div>';
-                carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].co2Fuel + '</span><span class="detail-value">' + car.co2 + 'g / ' + car.fuel + '</span></div>';
+                carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].co2Fuel + '</span><span class="detail-value">' + car.co2 + 'g / ' + translateFuelType(car.fuel) + '</span></div>';
                 carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].annualBik + '</span><span class="detail-value">€' + Math.round(annualBIK).toLocaleString() + '</span></div>';
                 carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].monthlyTax + '</span><span class="detail-value">€' + Math.round(netMonthlyCost).toLocaleString() + '</span></div>';
                 carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].rszLostMonth + '</span><span class="detail-value highlight">€' + Math.round(monthlyRSZLost).toLocaleString() + '</span></div>';
                 carComparisonHTML += '<div class="detail-row"><span class="detail-label">' + labels[currentLanguage].co2TaxYear + '</span><span class="detail-value">€' + Math.round(solidarityContribution).toLocaleString() + '</span></div>';
                 carComparisonHTML += '</div>';
                 carComparisonHTML += '<div class="monthly-loss-box">';
-                carComparisonHTML += '<div class="detail-row"><span class="detail-label" style="font-weight: 500;">' + labels[currentLanguage].monthlyPensionLoss + '</span><span class="detail-value pension-loss">-€' + Math.round(monthlyPensionLoss) + '/mois</span></div>';
+                carComparisonHTML += '<div class="detail-row"><span class="detail-label" style="font-weight: 500;">' + labels[currentLanguage].monthlyPensionLoss + '</span><span class="detail-value pension-loss">-€' + Math.round(monthlyPensionLoss) + translations[currentLanguage]['units.perMonth'] + '</span></div>';
                 carComparisonHTML += '<div class="detail-row"><span class="detail-label" style="font-size: 0.85rem;">' + labels[currentLanguage].duringRetirement + '</span><span class="detail-value" style="font-size: 0.85rem;">' + labels[currentLanguage].everyMonthFor + ' ' + retirementYears + ' ' + labels[currentLanguage].years + '</span></div>';
                 carComparisonHTML += '<div class="detail-row" style="margin-top: 12px;"><span class="detail-label">' + labels[currentLanguage].totalLifetimeLoss + '</span><span class="detail-value pension-loss">€' + Math.round(totalPensionLoss).toLocaleString() + '</span></div>';
                 carComparisonHTML += presentValueRow;
@@ -1722,9 +1738,9 @@
             
             let summaryHTML = '<h3>' + summaryLabels[currentLanguage].monthlyImpact + '</h3>';
             summaryHTML += '<div class="summary-grid" style="margin-bottom: 32px;">';
-            summaryHTML += '<div class="summary-item"><div class="summary-value" style="color: #28a745;">-€' + Math.round(minMonthlyLoss) + '/mo</div><div class="summary-label">' + summaryLabels[currentLanguage].bestCase + '</div></div>';
+            summaryHTML += '<div class="summary-item"><div class="summary-value" style="color: #28a745;">-€' + Math.round(minMonthlyLoss) + translations[currentLanguage]['units.perMo'] + '</div><div class="summary-label">' + summaryLabels[currentLanguage].bestCase + '</div></div>';
-            summaryHTML += '<div class="summary-item"><div class="summary-value" style="color: #6c757d;">-€' + Math.round(avgMonthlyLoss) + '/mo</div><div class="summary-label">' + summaryLabels[currentLanguage].average + '</div></div>';
+            summaryHTML += '<div class="summary-item"><div class="summary-value" style="color: #6c757d;">-€' + Math.round(avgMonthlyLoss) + translations[currentLanguage]['units.perMo'] + '</div><div class="summary-label">' + summaryLabels[currentLanguage].average + '</div></div>';
-            summaryHTML += '<div class="summary-item"><div class="summary-value" style="color: #dc3545;">-€' + Math.round(maxMonthlyLoss) + '/mo</div><div class="summary-label">' + summaryLabels[currentLanguage].worstCase + '</div></div>';
+            summaryHTML += '<div class="summary-item"><div class="summary-value" style="color: #dc3545;">-€' + Math.round(maxMonthlyLoss) + translations[currentLanguage]['units.perMo'] + '</div><div class="summary-label">' + summaryLabels[currentLanguage].worstCase + '</div></div>';
             summaryHTML += '<div class="summary-item"><div class="summary-value">' + retirementYears + ' ' + labels[currentLanguage].years + '</div><div class="summary-label">' + summaryLabels[currentLanguage].duration + '</div></div>';
             summaryHTML += '</div>';