Fix single quotes in properties files

Embarrassingly, one of these is from my PR #3588

cli/src/main/resources/hudson/cli/client/Messages.properties

@@ -8,7 +8,7 @@ CLI.Usage=Jenkins CLI\n\
   \ -i KEY              : SSH private key file used for authentication (for use with -ssh or -remoting)\n\
   \ -p HOST:PORT        : HTTP proxy host and port for HTTPS proxy tunneling. See https://jenkins.io/redirect/cli-https-proxy-tunnel\n\
   \ -noCertificateCheck : bypass HTTPS certificate check entirely. Use with caution\n\
-  \ -noKeyAuth          : don't try to load the SSH authentication private key. Conflicts with -i\n\
+  \ -noKeyAuth          : don''t try to load the SSH authentication private key. Conflicts with -i\n\
   \ -user               : specify user (for use with -ssh)\n\
   \ -strictHostKey      : request strict host key checking (for use with -ssh)\n\
   \ -logger FINE        : enable detailed logging from the client\n\
@@ -17,7 +17,7 @@ CLI.Usage=Jenkins CLI\n\
   \                                 Passing crendentials by a file is recommended.\n\
   \                                 See https://jenkins.io/redirect/cli-http-connection-mode for more info and options.\n\
   \n\
-  The available commands depend on the server. Run the 'help' command to \
+  The available commands depend on the server. Run the ''help'' command to \
   see the list.
 CLI.NoURL=Neither -s nor the JENKINS_URL env var is specified.
 CLI.VersionMismatch=Version mismatch. This CLI cannot work with this Jenkins server.

core/src/main/resources/jenkins/security/UpdateSiteWarningsConfiguration/config.properties

@@ -24,6 +24,6 @@ warning.core = Jenkins core: {0}
 warning.plugin = {0}: {1} 
 
 blurb = This section allows you to suppress warnings, applicable to your Jenkins \
-  configuration, provided by the updates sites. If you do, they won't be shown by \
+  configuration, provided by the updates sites. If you do, they won\u2019t be shown by \
   the Update Site Warnings administrative monitor. \
   Checked warnings are reported (the default), unchecked warnings are hidden.