fix: add languageSelector function and translate icon for admin context

- Add languageSelector() function to admin init-alpine.js for use
  in language selector macros on admin components page
- Add 'translate' icon to icons.js for language selector display

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/admin/js/init-alpine.js

@@ -163,4 +163,57 @@ function data() {
     // ─────────────────────────────────────────────────────────────────
     currentPage: ''
   }
-}
+}
+
+/**
+ * Language selector component for i18n support
+ * Used by language_selector macros in templates
+ *
+ * @param {string} currentLang - Current language code (e.g., 'fr')
+ * @param {Array} enabledLanguages - Array of enabled language codes
+ * @returns {Object} Alpine.js component data
+ */
+function languageSelector(currentLang, enabledLanguages) {
+    return {
+        isLangOpen: false,
+        currentLang: currentLang || 'fr',
+        languages: enabledLanguages || ['fr', 'de', 'en'],
+        languageNames: {
+            'en': 'English',
+            'fr': 'Français',
+            'de': 'Deutsch',
+            'lb': 'Lëtzebuergesch'
+        },
+        languageFlags: {
+            'en': 'gb',
+            'fr': 'fr',
+            'de': 'de',
+            'lb': 'lu'
+        },
+        async setLanguage(lang) {
+            if (lang === this.currentLang) {
+                this.isLangOpen = false;
+                return;
+            }
+            try {
+                const response = await fetch('/api/v1/language/set', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify({ language: lang })
+                });
+                if (response.ok) {
+                    this.currentLang = lang;
+                    window.location.reload();
+                }
+            } catch (error) {
+                console.error('Failed to set language:', error);
+            }
+            this.isLangOpen = false;
+        }
+    };
+}
+
+// Export to window for use in templates
+window.languageSelector = languageSelector;