Simplify english

core/src/main/resources/hudson/model/Messages.properties

@@ -246,7 +246,7 @@ Slave.Remote.Director.Mandatory=Remote directory is mandatory
 Slave.Terminated={0} slave agent was terminated
 Slave.Remote.Relative.Path.Warning=Are you sure you want to use a relative path for the FS root? Note that relative \
   paths require that you can assure that the selected launcher provides a consistent current working directory. Using \
-  an absolute path is strongly encouraged and highly recommended.
+  an absolute path is highly recommended.
 Slave.UnableToLaunch=Unable to launch the slave agent for {0}{1}
 Slave.UnixSlave=This is a Unix slave
 Slave.WindowsSlave=This is a Windows slave