[28358] Fix label for timeline config modal

https://community.openproject.com/wp/28358

[ci skip]

config/locales/js-en.yml

@@ -474,8 +474,7 @@ en:
         years: "Years"
         slider: "Zoom slider"
         description: >
-          Either select the initial zoom level that should be shown or check the auto zoom box to adjust the gantt chart
+          Select the initial zoom level that should be shown when autozoom is not available.
-          to fit the visible area.
     tl_toolbar:
       zooms: "Zoom level"
       outlines: "Hierarchy level"