[5.1] com_redirect - inline help for Activate Advanced Mode button

[pe7er]

The PR adds missing inline help for the Activate Advanced Mode in the Redirect: Options

Summary of Changes

In the Redirects Options, there is an "Activate Advanced Mode" button, the purpose of which isn't immediately clear. This PR adds inline help that explains the Advanced Mode button in the Options of the Redirects

Testing Instructions

System > Redirects > [Options] button > click on the [Toggle Inline Help] button

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• [ ] Documentation link for docs.joomla.org:

• [ ] No documentation changes for docs.joomla.org needed

• [ ] Pull Request link for manual.joomla.org:

• [ ] No documentation changes for manual.joomla.org needed

[brianteeman]

For reference the original string in joomla 3 was the much less useful COM_REDIRECT_MODE_DESC="Enable more advanced functionality for the component. Only use this if you know what you're doing."

[LadySolveig]

Thank you @pe7er and for review @brianteeman