Rename zh_hans to zh-Hans.

We keep the underscore to help with fallback languages. So in that respect pt_BR
falls back to pt in case of untranslated strings. zh-Hans is a way of writing
Chinese, as is zh-Hant. Neither of them can or should fall back on a
(non-existent) zh language code. They can be combined to form zh-Hans_CN and
zh-Hans_TW if there are ever translators that want to further refine that
dialect.

data/catalogs/apps/activitymonitor/zh-Hans.catkeys

@@ -0,0 +1,48 @@
+1	simplified_chinese	x-vnd.Haiku-ActivityMonitor	3704566709
+%.1f KB/s	DataSource		%.1f KB/s
+%.1f MB	DataSource		%.1f MB
+%.1f faults/s	DataSource		%.1f faults/s
+%lld ms	SettingsWindow		%lld ms
+%lld sec.	SettingsWindow		%lld sec.
+ActivityMonitor	System name		系统监视器
+Add graph	ActivityWindow		添加图示
+Additional items	ActivityView		附加项
+Apps	DataSource		应用程序
+Block cache	DataSource		高速缓存
+Block cache memory	DataSource		高速缓存
+CPU	DataSource		CPU
+CPU usage	DataSource		CPU使用率
+CPU usage (combined)	DataSource		CPU 使用率（总和）
+Cache	DataSource		高速缓存
+Cached memory	DataSource		缓存内存
+File	ActivityWindow		文件
+Hide legend	ActivityView		隐藏说明
+MB	DataSource		MB
+Media nodes	DataSource		媒介节点
+Memory	DataSource		内存
+Network receive	DataSource		网络接收
+Network send	DataSource		网络发送
+P-faults	DataSource		页面错误
+Page faults	DataSource		页面错误
+Ports	DataSource		端口
+Quit	ActivityWindow		退出
+RX	DataSource	Shorter version for Receiving.	RX
+Raw clipboard	DataSource		原始剪贴板
+Receiving	DataSource		接收
+Remove graph	ActivityView		删除图示
+Running applications	DataSource		运行程序
+Semaphores	DataSource		信号量
+Sems	DataSource		Sems
+Sending	DataSource		发送
+Settings	ActivityWindow		设置
+Settings…	ActivityWindow		设置...
+Show legend	ActivityView		显示说明
+Swap	DataSource		Swap
+Swap space	DataSource		交换空间
+TX	DataSource	Shorter version for Sending	TX
+Teams	DataSource		团队
+Text clipboard	DataSource		文本剪贴板
+Threads	DataSource		线程
+Update time interval:	SettingsWindow		更新频率：
+Used memory	DataSource		已用内存
+usage	DataSource		使用情况