VpnDialogs: add string description for translation.

Change-Id: Id826838661e8cfa20d01a4f51943f7744a2665e2

Author: Chia-chi Yeh

packages/VpnDialogs/res/values/strings.xml

@@ -16,29 +16,41 @@
 
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
 
+    <!-- Dialog title to identify the request from a VPN application. [CHAR LIMIT=60] -->
     <string name="prompt"><xliff:g id="app">%s</xliff:g>
         attempts to create a VPN connection.
     </string>
 
+    <!-- Dialog message to warn about the risk of using a VPN application. [CHAR LIMIT=NONE] -->
     <string name="warning">By proceeding, you are giving the application
         permission to intercept all network traffic.
         <b>Do NOT accept unless you trust the application.</b> Otherwise,
         you run the risk of having your data compromised by a malicious
         software.
     </string>
 
+    <!-- Checkbox label to accept the request from a VPN application. [CHAR LIMIT=60] -->
     <string name="accept">I trust this application.</string>
 
+    <!-- Dialog title for built-in VPN. [CHAR LIMIT=40]  -->
     <string name="legacy_title">VPN is connected</string>
+    <!-- Button label to configure the current VPN session. [CHAR LIMIT=20] -->
     <string name="configure">Configure</string>
+    <!-- Button label to disconnect the current VPN session. [CHAR LIMIT=20] -->
     <string name="disconnect">Disconnect</string>
 
+    <!-- Label for the name of the current VPN session. [CHAR LIMIT=20] -->
     <string name="session">Session:</string>
+    <!-- Label for the duration of the current VPN session. [CHAR LIMIT=20] -->
     <string name="duration">Duration:</string>
+    <!-- Label for the network usage of data transmitted over VPN. [CHAR LIMIT=20] -->
     <string name="data_transmitted">Sent:</string>
+    <!-- Label for the network usage of data received over VPN. [CHAR LIMIT=20] -->
     <string name="data_received">Received:</string>
 
+    <!-- Dummy string for a blank value. [CHAR LIMIT=40] -->
     <string name="blank_value">--</string>
+    <!-- Formatted string for the network usage over VPN. [CHAR LIMIT=40] -->
     <string name="data_value_format">
         <xliff:g id="number">%1$s</xliff:g> bytes /
         <xliff:g id="number">%2$s</xliff:g> packets