To reproduce:

1. Log in as admin.
2. Make sure debugging's turned on.
3. Go to "Site administration / Licence / Licence manager"
4. Create a custom license.
5. Save the changes.
6. Open a page with an editor. (E.g. the edit profile page)
7. Expected: The page will load okay
8. Actual: The following debug message is being shown

   Invalid get_string() identifier: 'Testlicense' or component 'license'. Perhaps you are missing $string['Testlicense'] = ''; in lang/en/license.php?

   line 353 of /lib/classes/string_manager_standard.php: call to debugging()

   line 7387 of /lib/moodlelib.php: call to core_string_manager_standard->get_string()

   line 545 of /files/renderer.php: call to get_string()

   line 410 of /files/renderer.php: call to core_files_renderer->create_license_help_icon_context()

   line 516 of /files/renderer.php: call to core_files_renderer->fp_js_template_selectlayout()

   line 3199 of /repository/lib.php: call to core_files_renderer->filepicker_js_templates()

   line 356 of /lib/form/editor.php: call to initialise_filepicker()

   line 486 of /lib/form/editor.php: call to MoodleQuickForm_editor->toHtml()

   line 4667 of /lib/outputrenderers.php: call to MoodleQuickForm_editor->export_for_template()

   line 3146 of /lib/formslib.php: call to core_renderer->mform_element()

   line 430 of /lib/pear/HTML/QuickForm/element.php: call to MoodleQuickForm_Renderer->renderElement()

   line 1653 of /lib/pear/HTML/QuickForm.php: call to HTML_QuickForm_element->accept()

   line 1905 of /lib/formslib.php: call to HTML_QuickForm->accept()

   line 1696 of /lib/pear/HTML/QuickForm.php: call to MoodleQuickForm->accept()

   line 445 of /lib/pear/HTML/Common.php: call to HTML_QuickForm->toHtml()

   line 989 of /lib/formslib.php: call to HTML_Common->display()

   line 357 of /user/editadvanced.php: call to moodleform->display()