You can use Editing Buttons to add a new NLS file, delete an existing NLS file, and edit a NLS file.
You need to select a NLS element from Element List before, so that Editing Buttons get activated.
Click the add button and the following dialog will display:
Here user has the ability to add the required key and value in the dialog window. Then click the OK button, then the key and value will display in current Element List
Click the delete button and the selected key and value will be deleted in the dialog window.
Click the update button and relative update dialog will display as the following shows:
Here user has the ability to modify the key and value, according to their requirement. Then click the OK button to verify your update. Finally the update result would be displayed in Element List panel.