Make link type labels and order consistent with WYSIWYG

[purplespider]

When adding a link to a page this module uses the terminology "Site Tree Link" in the UI, but I don't believe the term "Site Tree" is used anywhere else in the CMS.

For clarity and consistency can we make the terminology the same as when inserting a link via the WYSIWYG, e.g.:

Current linkfield module for comparison:

(I started trying to do this myself, but unfortunately I don't do React).

Acceptance criteria

• The labels in the LinkField drop down are updated to match the equivalent label in the WYSIWYG drop down
  • "SiteTree Link" is updated to be "Page on this site".
• The Link titles remain unchanged everywhere else.
• The options in the LinkField drop down are displayed in the same order that they're in with the WYSIWYG drop down

PR

• ENH Add sorting by link type #167

[purplespider]

@maxime-rainville How can I get some eyes on this? Do you agree? Any potential complications?

[maxime-rainville]

We're doing a bunch of work on this right now. I've added this to the backlog.

[GuySartorelli]

PR merged