Addedd support for older Gnome (3.36, 3.38)

extension.js

@@ -27,7 +27,9 @@ const Mainloop = imports.mainloop;
 const PanelMenu = imports.ui.panelMenu;
 const PopupMenu = imports.ui.popupMenu;
 const Volume = imports.ui.status.volume;
-const _ = ExtensionUtils.gettext;
+const Gettext = imports.gettext;
+const Domain = Gettext.domain(GETTEXT_DOMAIN);
+const _ = Domain.gettext;
 
 const DEFAULT_OUTPUT_ICON = 'audio-speakers-symbolic';
 
@@ -136,4 +138,4 @@ class Extension {
 
 function init(meta) {
     return new Extension(meta.uuid);
-}
+}

metadata.json

@@ -1,13 +1,14 @@
 {
-  "_generated": "Generated by SweetTooth, do not edit",
   "description": "Add Mute/Unmute functionality to audio output icon remembering unmuted volume level",
   "name": "Mute/Unmute",
   "shell-version": [
+    "3.36",
+    "3.38",
     "40",
     "41",
     "42"
   ],
   "url": "https://github.com/ihpled/mute-unmute",
   "uuid": "[email protected]",
-  "version": 4
+  "version": 5
 }