Replacing tooltip labels to Next|Previous Key Point

Author: vincentdavoust

src/windows/ui/main-window.ui

@@ -876,10 +876,10 @@
      <normaloff>:/icons/Humanity/actions/16/go-first.svg</normaloff>:/icons/Humanity/actions/16/go-first.svg</iconset>
    </property>
    <property name="text">
-    <string>Previous Marker/Keyframe</string>
+    <string>Previous Key Point</string>
    </property>
    <property name="toolTip">
-    <string>Previous Marker/Keyframe</string>
+    <string>Previous Key Point</string>
    </property>
   </action>
   <action name="actionNextMarker">
@@ -888,10 +888,10 @@
      <normaloff>:/icons/Humanity/actions/16/go-last.svg</normaloff>:/icons/Humanity/actions/16/go-last.svg</iconset>
    </property>
    <property name="text">
-    <string>Next Marker/Keyframe</string>
+    <string>Next Key Point</string>
    </property>
    <property name="toolTip">
-    <string>Next Marker/Keyframe</string>
+    <string>Next Key Point</string>
    </property>
   </action>
   <action name="actionCenterOnPlayhead">