Hard coded field description on link field

[tanc]

At the moment the field description for the optional title on the link field is hard-coded to say "If you don't write anything here, we will use: More information"

It would be better if this was managed in config so it can be overwritten on a per site basis. That way this field can be adapted to suit the needs of the site. For instance on Lambeth the title field needs to be required due to the front-end complexity of Drupal outputting a GeneratedLink rather than a standard render array depending on whether you fill in the title or not.

[tanc]

https://github.com/localgovdrupal/localgov_alert_banner/blob/master/src/Form/AlertBannerEntityForm.php#L133

[andybroomfield]

As long as we keep it as the default, it should be fine.
The link field is provided by config, so simply needs to be added there and the form alter hook can be removed.
May also need to remove the generated text in the templates.
If someone wants to make a Pull Request will review.

[andybroomfield]

The description is coded to the link title part of the widget, which isn't something that can currently be set in Drupal UI.