snespatcher/resources/appmenu.xml

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <requires lib="gtk" version="4.0"/>
      <menu id="app-menu">
        <section>
          <item>
            <attribute name="label" translatable="yes">_About SNES Patcher</attribute>
            <attribute name="action">app.about</attribute>
          </item>
        </section>
        <section>
          <item>
            <attribute name="label" translatable="yes">_Quit</attribute>
            <attribute name="action">app.quit</attribute>
          </item>
        </section>
      </menu>
</interface>