Fix grammatical error in host overload message.

remoting/resources/remoting_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <grit base_dir="." current_release="1" enc_check="möl" latest_public_release="0" source_lang_id="en">
   <outputs>
     <output filename="remoting/base/string_resources.h" type="rc_header">
       <emit emit_type="prepend"/>
     </output>
 
     <output filename="remoting/resources/am.pak" lang="am" type="data_package"/>
     <output filename="remoting/resources/ar.pak" lang="ar" type="data_package"/>
@@ skipping 722 matching lines @@
       <message desc="Label for the 'yes' response to the dialog asking the user to confirm whether or not they want to disable remote access to a host." name="IDS_DISABLE_HOST">
         Disable
       </message>
       <message desc="Label for the client-side disconnect button. Clicking this button disconnects oneself from the host." name="IDS_DISCONNECT_MYSELF_BUTTON" formatter_data="android_java">
         Disconnect
       </message>
       <message desc="Column header in the connection history table showing the length of time for which a connection was active, if available." name="IDS_DURATION_HEADER">
         Duration
       </message>
       <message desc="Error that is shown on the client side when the host is blocking all connections due to failed authentication attempts." name="IDS_ERROR_HOST_OVERLOAD" formatter_data="android_java">
-        Connections to the remote computer are temporarily blocked because somebody was trying to connect to it with invalid PIN. Please try again later.
+        Connections to the remote computer are temporarily blocked because somebody was trying to connect to it with an invalid PIN. Please try again later.
       </message>
       <message desc="Error that is shown on the client side after the host has terminated connection that lasted more than maximum allowed duration." name="IDS_ERROR_MAX_SESSION_LENGTH" formatter_data="android_java">
         The remote session has expired.
       </message>
       <message desc="Error that is shown on the client side the host has failed to accept the connection due to a configuration issue." name="IDS_ERROR_HOST_CONFIGURATION_ERROR" formatter_data="android_java">
         The remote computer has failed to initialize the session. If problem persist please try to configure the host again.
       </message>
 
       <message desc="Error that is shown on the client side when we don't get a response from the host." name="IDS_ERROR_HOST_IS_OFFLINE" formatter_data="android_java">
         The remote computer is not responding to connection requests. Please verify that it is online and try again.
@@ skipping 429 matching lines @@
       <message desc="Platform-specific text indicating that a component is for the Mac OS." name="IDS_FOR_PLATFORM_MAC">
         For Mac (OS X Mavericks 10.9 and above)
       </message>
       <message desc="Text for the button the user clicks to indicate that they agree to the terms of service and want to proceed with downloading the installer." name="IDS_ACCEPT_AND_INSTALL">
         Accept and Install
       </message>
 
     </messages>
   </release>
 </grit>