Rename timeline types to make clearer

lib/models/TimelineIdentifiers.dart

@@ -9,17 +9,17 @@ enum TimelineType {
   String toLabel() {
     switch (this) {
       case TimelineType.home:
-        return 'Home';
+        return 'My Network';
       case TimelineType.global:
-        return 'Global';
+        return 'Global Fediverse';
       case TimelineType.local:
-        return 'Local';
+        return 'Local Fediverse';
       case TimelineType.group:
-        return 'Group';
+        return 'Groups (Lists)';
       case TimelineType.profile:
         return 'Profile';
       case TimelineType.self:
-        return 'Yours';
+        return 'My Posts';
     }
   }
 }