修复语言选择器未找到的警告并添加错误处理提示

src/web/managers/settings.py

@@ -69,8 +69,9 @@ class SettingsManager:
                 _.set_language(language)
                 self._settings.language = language
             except ValueError as e:
-                # Invalid language, skip update
-                pass
+                # Invalid language, log warning
+                import logging
+                logging.warning(f"Invalid language '{language}': {e}")
         if "connection_quality" in settings_data:
             self._settings.connection_quality = settings_data["connection_quality"]
         if "proxy" in settings_data:

web/static/app.js

@@ -893,7 +893,10 @@ async function fetchAndPopulateLanguages() {
         const data = await response.json();
 
         const languageSelect = document.getElementById('language');
-        if (!languageSelect) return;
+        if (!languageSelect) {
+            console.warn('Language select element not found');
+            return;
+        }
 
         // Clear existing options
         languageSelect.innerHTML = '';
@@ -912,6 +915,11 @@ async function fetchAndPopulateLanguages() {
         }
     } catch (error) {
         console.error('Failed to fetch languages:', error);
+        const languageSelect = document.getElementById('language');
+        if (languageSelect) {
+            languageSelect.innerHTML = '<option value="">Failed to load languages</option>';
+        }
+        addConsoleLine('Error: Unable to fetch available languages. Please check your connection or try again later.');
     }
 }