Add changelog entry

Add spec

The project param is unnecessary here

Since label presenter is used in label index view, label class
check doesn't work as expected because the class is now LabelPresenter.

Also `label.subject` doesn't work as expected now because Label's model
`subject` method is shadowed by Gitlab's presenter's method which uses
`subject` for referencing the original object.

Instead we use a presenter's method for both checks now.

`label_deletion_confirm_text` is not used anywhere so it's removed

When rendering a label we want to check 'scoped_label' feature
availability on a project/group where label is being used. For
this reason a label presenter is used in UI and information about
context project/group is passed to this presenter.

Check this feature per project/group instead of globally.
Also do not show tooltip if it's disabled.

Sorts labels alphabetically on issues (and merge requests) list.
Before it was order id desc.
Now it will be consistent with sidebar and labels page.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Rémy Coutable <remy@rymai.me>

This reverts commit cb10b725c8929b8b4460f89c9d96c773af39ba6b.

See !3846#note_5033951

You can set type: :merge_request to create a link to merge request
lists instead of issues list. Accept both Symbol & String as type
argument for the link_to_label helper

Closes #12677

Closes #2619

Closes https://github.com/gitlabhq/gitlabhq/issues/9631

Commit ranges, commits, external issues, issues, labels, merge requests,
snippets, users.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>