diff --git a/src/apps/desktop/src/api/i18n_api.rs b/src/apps/desktop/src/api/i18n_api.rs
index 55564dec..4d09c81e 100644
--- a/src/apps/desktop/src/api/i18n_api.rs
+++ b/src/apps/desktop/src/api/i18n_api.rs
@@ -1,7 +1,8 @@
 //! I18n API
 
 use crate::api::app_state::AppState;
-use log::{error, info};
+use bitfun_core::service::i18n::{get_global_i18n_service, LocaleId};
+use log::{error, info, warn};
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use tauri::State;
@@ -60,6 +61,20 @@ pub async fn i18n_set_language(
     {
         Ok(_) => {
             info!("Language set to: {}", request.language);
+
+            // Sync the in-memory I18nService so bot/remote-connect responses
+            // use the newly selected language without requiring an app restart.
+            if let Some(locale_id) = LocaleId::from_str(&request.language) {
+                if let Some(i18n_service) = get_global_i18n_service().await {
+                    if let Err(e) = i18n_service.set_locale(locale_id).await {
+                        warn!(
+                            "Failed to sync I18nService locale after language change: language={}, error={}",
+                            request.language, e
+                        );
+                    }
+                }
+            }
+
             #[cfg(target_os = "macos")]
             {
                 let has_workspace = state.workspace_path.read().await.is_some();
diff --git a/src/apps/desktop/src/lib.rs b/src/apps/desktop/src/lib.rs
index 2ee700ba..77661670 100644
--- a/src/apps/desktop/src/lib.rs
+++ b/src/apps/desktop/src/lib.rs
@@ -88,6 +88,22 @@ pub async fn run() {
         return;
     }
 
+    // Initialize global I18nService so bot/remote-connect language is always in sync.
+    {
+        use bitfun_core::service::config::get_global_config_service;
+        use bitfun_core::service::i18n::initialize_global_i18n_service;
+        match get_global_config_service().await {
+            Ok(config_service) => {
+                if let Err(e) = initialize_global_i18n_service(Some(config_service)).await {
+                    log::error!("Failed to initialize global I18nService: {}", e);
+                }
+            }
+            Err(e) => {
+                log::error!("Failed to get config service for I18nService init: {}", e);
+            }
+        }
+    }
+
     let startup_log_level = resolve_runtime_log_level(log_config.level).await;
 
     if let Err(e) = AIClientFactory::initialize_global().await {