Rewording of menu item.

src/components/topmenu.tsx

@@ -165,7 +165,7 @@ export const TopMenu = function(props: { onClick?: () => void }) {
                     {fullWidthSupport ? <ToggleOnIcon fontSize="small" /> : <ToggleOffIcon fontSize="small" />}
                 </ListItemIcon>
                 <ListItemText>
-                    {`Allow `}
+                    {fullWidthSupport ? `Disable ` : `Enable `}
                     <Tooltip
                         title="Minidiscs have 2 slots for titles - the default half-width one used for standard alphabet and half-width katakana, and full-width for hiragana and kanji."
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