Fix message for InvalidProtocolBufferException

csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs

diff --git a/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs b/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs
index eeb0f13..0fbc530 100644
--- a/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs
+++ b/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs
@@ -61,7 +61,7 @@
         {

             return new InvalidProtocolBufferException(

                 "While parsing a protocol message, the input ended unexpectedly " +

-                "in the middle of a field.  This could mean either than the " +

+                "in the middle of a field.  This could mean either that the " +

                 "input has been truncated or that an embedded message " +

                 "misreported its own length.");

         }

javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java

diff --git a/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java b/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java
index 3864d38..9a83d6d 100644
--- a/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java
+++ b/javanano/src/main/java/com/google/protobuf/nano/InvalidProtocolBufferNanoException.java
@@ -48,7 +48,7 @@
   static InvalidProtocolBufferNanoException truncatedMessage() {
     return new InvalidProtocolBufferNanoException(
       "While parsing a protocol message, the input ended unexpectedly " +
-      "in the middle of a field.  This could mean either than the " +
+      "in the middle of a field.  This could mean either that the " +
       "input has been truncated or that an embedded message " +
       "misreported its own length.");
   }