lib/model: Clarify master terminology (fixes #2679)

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3793

gui/default/syncthing/folder/editFolderModalView.html

@@ -86,8 +86,8 @@
               <label translate>Folder Type</label>
               &nbsp;<a href="https://docs.syncthing.net/users/foldermaster.html" target="_blank"><span class="fa fa-book"></span>&nbsp;<span translate>Help</span></a>
               <select class="form-control" ng-model="currentFolder.type">
-                <option value="readwrite" translate>Normal</option>
-                <option value="readonly" translate>Master</option>
+                <option value="readwrite" translate>Send &amp; Receive</option>
+                <option value="readonly" translate>Send Only</option>
               </select>
               <p ng-if="currentFolder.type == 'readonly'" translate class="help-block">Files are protected from changes made on other devices, but changes made on this device will be sent to the rest of the cluster.</p>
             </div>