tdf#101731 Rename gradient border label to midpoint

Renamed gradient border label to Mid_point

Change-Id: Icda875d3c6f03ffd29395ac5ce932475cc629361
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136851
Tested-by: Jenkins
Reviewed-by: Hossein <hossein@libreoffice.org>
diff --git a/cui/uiconfig/ui/gradientpage.ui b/cui/uiconfig/ui/gradientpage.ui
index 6a66dad..e2ec661 100644
--- a/cui/uiconfig/ui/gradientpage.ui
+++ b/cui/uiconfig/ui/gradientpage.ui
@@ -390,7 +390,7 @@
                  <object class="GtkLabel" id="borderft">
                    <property name="visible">True</property>
                    <property name="can_focus">False</property>
                    <property name="label" translatable="yes" context="gradientpage|borderft">_Border:</property>
                    <property name="label" translatable="yes" context="gradientpage|borderft">Mid_point:</property>
                    <property name="use_underline">True</property>
                    <property name="mnemonic_widget">bordermtr</property>
                    <property name="xalign">0</property>