Revert "tdf#101731 Rename gradient border label to midpoint"

This reverts commit 5e7663b792ee1d56838d7a5082e5c29867f839f2.

Reason for revert: Change based on a misunderstanding

Change-Id: I6187b89e86652fe3a2d0ccb82c1c93922064c3d4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145123
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Jenkins
diff --git a/cui/uiconfig/ui/gradientpage.ui b/cui/uiconfig/ui/gradientpage.ui
index e2ec661..6a66dad 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">Mid_point:</property>
                    <property name="label" translatable="yes" context="gradientpage|borderft">_Border:</property>
                    <property name="use_underline">True</property>
                    <property name="mnemonic_widget">bordermtr</property>
                    <property name="xalign">0</property>