Add more zh_CN translations

Change-Id: I93d5772b3a95dc5606070778a89470510005bc6d
diff --git a/web/gui/src/main/resources/org/onosproject/ui/lion/core/fw/Mast_zh_CN.properties b/web/gui/src/main/resources/org/onosproject/ui/lion/core/fw/Mast_zh_CN.properties
index e816069..2395eea 100644
--- a/web/gui/src/main/resources/org/onosproject/ui/lion/core/fw/Mast_zh_CN.properties
+++ b/web/gui/src/main/resources/org/onosproject/ui/lion/core/fw/Mast_zh_CN.properties
@@ -17,7 +17,7 @@
 # Localization strings for Masthead
 
 # Tooltip for context-sensitive help button [?]
-#tt_help=
+tt_help=显示当前视图的帮助页面
 
 # Logout button
-#logout=
+logout=注销