Text fix: customisations -> customizations

Backport of musescore#26574

build/Linux+BSD/org.musescore.MuseScore.appdata.xml.in

@@ -142,7 +142,7 @@
            <li>Multiple improvements to the Plugin API</li>
            <li>Implement changing palette and palette cell properties on fly</li>
            <li>Current workspace is automatically saved on each action that changes the workspace</li>
-           <li>Palettes and workspaces can be reset to the default state defined by the workspace you started customisations from</li>
+           <li>Palettes and workspaces can be reset to the default state defined by the workspace you started customizations from</li>
            <li>Improve algorithm for determining start point for note input</li>
            <li>Move the viewport to show actual changes in the score if they are outside of the current view</li>
          </ul>