add touch option: four finger tap

src/config/i18n.js

@@ -679,4 +679,8 @@ export const I18N = {
     zh: `三指轻触`,
     en: `Three finger tap`,
   },
+  touch_tap_4: {
+    zh: `四指轻触`,
+    en: `Four finger tap`,
+  },
 };

src/views/Options/Setting.js

@@ -181,7 +181,7 @@ export default function Settings() {
             label={i18n("touch_translate_shortcut")}
             onChange={handleChange}
           >
-            {[0, 2, 3].map((item) => (
+            {[0, 2, 3, 4].map((item) => (
               <MenuItem key={item} value={item}>
                 {i18n(`touch_tap_${item}`)}
               </MenuItem>