fix(i18n): translate backend errors at UI boundaries

crates/dbx-web/src/auth.rs

@@ -79,7 +79,7 @@ pub async fn login(State(state): State<Arc<WebState>>, Json(body): Json<LoginReq
                 let remaining = (locked_until - std::time::Instant::now()).as_secs();
                 return Ok((
                     StatusCode::TOO_MANY_REQUESTS,
-                    Json(serde_json::json!({"error": format!("请 {remaining} 秒后再试")})),
+                    Json(serde_json::json!({"error": format!("Please try again in {remaining}s")})),
                 )
                     .into_response());
             }

crates/dbx-web/src/routes/agents.rs

@@ -342,7 +342,7 @@ async fn ensure_no_agent_update_blockers(
     if blockers.is_empty() {
         Ok(())
     } else {
-        Err(format!("请先关闭以下数据库连接后再更新驱动: {}", blockers.join(", ")))
+        Err(format!("Close these database connections before updating drivers: {}", blockers.join(", ")))
     }
 }