tdf#67973 UI: change option name from "Format" to "Page numbers"

UI: change option name from "Format" to "Page numbers"
in dialog Page styles

Change-Id: Ia1f18e5ebfca4892fde01038be97472374eaf41f
Reviewed-on: https://gerrit.libreoffice.org/28372Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>
Reviewed-by: jan iversen <jani@documentfoundation.org>

cui/uiconfig/ui/pageformatpage.ui

 <?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.20.0 -->
 <interface>
   <requires lib="gtk+" version="3.0"/>
   <requires lib="LibreOffice" version="1.0"/>
@@ -108,7 +109,6 @@
                         <property name="can_focus">True</property>
                         <property name="halign">start</property>
                         <property name="invisible_char">•</property>
-                        <property name="invisible_char_set">True</property>
                         <property name="update_policy">if-valid</property>
                       </object>
                       <packing>
@@ -136,7 +136,6 @@
                         <property name="can_focus">True</property>
                         <property name="halign">start</property>
                         <property name="invisible_char">•</property>
-                        <property name="invisible_char_set">True</property>
                       </object>
                       <packing>
                         <property name="left_attach">1</property>
@@ -373,7 +372,6 @@
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
                         <property name="invisible_char">•</property>
-                        <property name="invisible_char_set">True</property>
                       </object>
                       <packing>
                         <property name="left_attach">1</property>
@@ -385,7 +383,6 @@
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
                         <property name="invisible_char">•</property>
-                        <property name="invisible_char_set">True</property>
                       </object>
                       <packing>
                         <property name="left_attach">1</property>
@@ -397,7 +394,6 @@
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
                         <property name="invisible_char">•</property>
-                        <property name="invisible_char_set">True</property>
                       </object>
                       <packing>
                         <property name="left_attach">1</property>
@@ -409,7 +405,6 @@
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
                         <property name="invisible_char">•</property>
-                        <property name="invisible_char_set">True</property>
                       </object>
                       <packing>
                         <property name="left_attach">1</property>
@@ -556,7 +551,7 @@
                         <property name="visible">True</property>
                         <property name="can_focus">False</property>
                         <property name="hexpand">True</property>
-                        <property name="label" translatable="yes">_Format:</property>
+                        <property name="label" translatable="yes">Page numbers:</property>
                         <property name="use_underline">True</property>
                         <property name="mnemonic_widget">comboLayoutFormat</property>
                         <property name="xalign">0</property>