Initial commit: Luftglanz drone website with integrated AI chat assistant

Features:
- Complete Luftglanz drone cleaning website
- AI chat assistant integrated with OpenAI API
- Expert product advice for AGO Quart and Mellerud cleaning products
- Formal German language support (Sie form)
- Secure PHP backend for API calls
- Responsive design with mobile support
- Product-specific knowledge base
- Safety statements from manufacturers
- Multi-page integration (index, products, services, contact)

Technical components:
- AI chat widget (js/ai-chat.js)
- Chat styling (css/components/ai-chat.css)
- Backend API (ai-chat-api.php)
- Product knowledge base with detailed specifications
- Demo and documentation files

js/language-manager.js

@@ -0,0 +1,66 @@
+/**
+ * Language Manager
+ * Simplified to use only German language
+ */
+
+const languageManager = {
+    currentLang: 'de', // Default language set to German
+
+    init: function() {
+        console.log('Initializing Language Manager');
+
+        // Always use German as the language
+        this.currentLang = 'de';
+        localStorage.setItem('preferredLanguage', 'de');
+
+        // Apply translations
+        this.applyTranslations();
+
+        // Update document language attribute
+        document.documentElement.lang = this.currentLang;
+
+        console.log(`Language Manager initialized with language: ${this.currentLang}`);
+    },
+
+    applyTranslations: function() {
+        if (typeof translations === 'undefined' || !translations['de']) {
+            console.error('German translations not available');
+            return;
+        }
+
+        const elements = document.querySelectorAll('[data-i18n]');
+        elements.forEach(element => {
+            const key = element.getAttribute('data-i18n');
+            const translation = translations['de'][key];
+            if (translation) {
+                if (element.tagName === 'INPUT' || element.tagName === 'TEXTAREA') {
+                    if (element.hasAttribute('placeholder')) {
+                        element.setAttribute('placeholder', translation);
+                    } else {
+                        element.value = translation;
+                    }
+                } else {
+                    element.textContent = translation;
+                }
+            } else {
+                console.warn(`Missing translation for key: ${key}`);
+            }
+        });
+
+        const altElements = document.querySelectorAll('[data-i18n-alt]');
+        altElements.forEach(element => {
+            const key = element.getAttribute('data-i18n-alt');
+            const translation = translations['de'][key];
+            if (translation) {
+                element.setAttribute('alt', translation);
+            }
+        });
+
+        console.log(`Applied German translations`);
+    }
+};
+
+// Initialize the language manager when the DOM is ready
+document.addEventListener('DOMContentLoaded', () => {
+    languageManager.init();
+});