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/workspaces/zh-Hans.catkeys

@@ -0,0 +1,12 @@
+1	simplified_chinese	x-vnd.Be-WORK	932379173
+About Workspaces…	Workspaces		关于工作区... 
+Always on top	Workspaces		置顶
+Auto-raise	Workspaces		自动
+Change workspace count…	Workspaces		修改工作区数量... 
+Invalid argument: %s\n	Workspaces		无效参数：%s\n
+OK	Workspaces		确定
+Quit	Workspaces		退出
+Show window border	Workspaces		显示窗口边框
+Show window tab	Workspaces		显示窗口标签
+Workspaces	System name		工作区
+Workspaces\nwritten by %1, and %2.\n\nCopyright %3, Haiku.\n\nSend windows behind using the Option key. Move windows to front using the Control key.\n	Workspaces		工作区\n编写者：%1，%2。\n\n版权所有%3 Haiku .Inc。\n\n使用 Alt 键将窗口置后。使用 Ctrl 键将窗口置前。\n