man: really fix all LC_MESSAGE to LC_MESSAGES

https://bugs.freedesktop.org/show_bug.cgi?id=35534

man/locale.conf.xml

@@ -128,7 +128,7 @@
                         <para><filename>/etc/locale.conf:</filename></para>
 
                         <programlisting>LANG=de_DE.UTF-8
-LC_MESSAGE=C</programlisting>
+LC_MESSAGES=C</programlisting>
                 </example>
 
         </refsect1>

units/getty@.service.m4

@@ -40,7 +40,7 @@ KillMode=process-group
 
 # Unset locale for the console getty since the console has problems
 # displaying some internationalized messages.
-Environment=LANG= LC_CTYPE= LC_NUMERIC= LC_TIME= LC_COLLATE= LC_MONETARY= LC_MESSAGE= LC_PAPER= LC_NAME= LC_ADDRESS= LC_TELEPHONE= LC_MEASUREMENT= LC_IDENTIFICATION=
+Environment=LANG= LC_CTYPE= LC_NUMERIC= LC_TIME= LC_COLLATE= LC_MONETARY= LC_MESSAGES= LC_PAPER= LC_NAME= LC_ADDRESS= LC_TELEPHONE= LC_MEASUREMENT= LC_IDENTIFICATION=
 
 # Some login implementations ignore SIGTERM, so we send SIGHUP
 # instead, to ensure that login terminates cleanly.