Steps to repro:

1. Create new Unity project;
2. In the Hierarchy click Create>Light>Rectangular Light;
3. Observe the Inspector panel.

Actual result:
'Rectangular' light is named as 'Area' light in the Light component's Type dropdown list (see attached screenshot). This creates an inconsistency within the product.
Regression introduced in Unity 2018.3.0a2.

Expected result:
'Rectangular' light is named as 'Rectangular' light in the Light component's Type dropdown list.

Notes:
- Reproducible in 2018.3.0a2;
- Not reproducible in 2018.3.0a1, 2018.2.0b9, 2018.1.5f1;
- Reproducible on Windows and OSX.