inform user about possible restart of Gajim for some ACE settings to apply

src/gtkgui.glade

@@ -11924,6 +11924,31 @@ Static</property>
 	</packing>
       </child>
+      <child>
+	<widget class="GtkLabel" id="label384">
+	  <property name="visible">True</property>
+	  <property name="label" translatable="yes">&lt;b&gt;NOTE:&lt;/b&gt; You may have to restart Gajim for some settings to apply.</property>
+	  <property name="use_underline">False</property>
+	  <property name="use_markup">True</property>
+	  <property name="justify">GTK_JUSTIFY_LEFT</property>
+	  <property name="wrap">False</property>
+	  <property name="selectable">False</property>
+	  <property name="xalign">0</property>
+	  <property name="yalign">0.5</property>
+	  <property name="xpad">0</property>
+	  <property name="ypad">0</property>
+	  <property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
+	  <property name="width_chars">-1</property>
+	  <property name="single_line_mode">False</property>
+	  <property name="angle">0</property>
+	</widget>
+	<packing>
+	  <property name="padding">0</property>
+	  <property name="expand">False</property>
+	  <property name="fill">False</property>
+	</packing>
+      </child>
+
       <child>
 	<widget class="GtkHButtonBox" id="hbuttonbox18">
 	  <property name="visible">True</property>