TT#21056 Decrease length of 'Maintenance mode' warning on ngcp-panel WEB interface

Otherwise it doesn't fit in one line and looks very ugly.

Change-Id: I42983aa72a19ff3f7bf3d9ede6873662fa8cffd1

share/layout/body.tt

@@ -77,7 +77,7 @@
         <div class="container">
             [% IF c.config.general.maintenance_mode -%]
                 <div class="alert alert-error" style="font-size:150%">
-                    <strong>[% c.loc('Maintenance mode is enabled! Please do not perform any write operations until maintenance mode has been switched off!') %]</strong>
+                    <strong>[% c.loc('Maintenance mode is enabled! Please do not perform any changes until maintenance mode has been switched off!') %]</strong>
                 </div>
             [% END -%]
             [% content %]