Handle plural

Author: davidbrochart

packages/labextension/src/widget.tsx

@@ -186,8 +186,7 @@ const KernelUsage = (props: {
           </h4>
           {usage.host_cpu_percent && (
             <div className="jp-KernelUsage-separator">
-              {usage.host_cpu_percent.toFixed(1)}% {props.trans.__('used on')}{' '}
-              {usage.cpu_count} CPUs
+              {props.trans._n('%2%% used on %1 CPU', '%2%% used on %1 CPUs', usage.cpu_count, usage.host_cpu_percent.toFixed(1))}
             </div>
           )}
           <h4 className="jp-KernelUsage-section-separator">