Related: tdf#153229 use 'System' instead of 'Automatic'

in the macOS desktop settings "Automatic" is used
to indicate that the theme changes automatically from
light to dark over time, "System" does seem a little
less ambigious as to its meaning here.

Change-Id: I38f6007cca1e8942d77066db200208ca463368d0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/146743
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/cui/uiconfig/ui/optviewpage.ui b/cui/uiconfig/ui/optviewpage.ui
index 92fa9be..a371f83 100644
--- a/cui/uiconfig/ui/optviewpage.ui
+++ b/cui/uiconfig/ui/optviewpage.ui
@@ -500,7 +500,7 @@
                    <property name="hexpand">True</property>
                    <property name="active">0</property>
                    <items>
                      <item translatable="yes" context="optviewpage|appearance">Automatic</item>
                      <item translatable="yes" context="optviewpage|appearance">System</item>
                      <item translatable="yes" context="optviewpage|appearance">Light</item>
                      <item translatable="yes" context="optviewpage|appearance">Dark</item>
                    </items>