Fixes Issue #1221 - confirm unit delete

[mikedivine]

Description

Added Confirmation Modal to "Delete Unit". Tested manually and looks to be functioning properly.

Fixes #1221

Type of change

• [ ] Note merging this changes the database configuration.
• [ ] This change requires a documentation update

Checklist

• [x] I have followed the OED pull request ideas
• [x] I have removed text in ( ) from the issue request
• [x] You acknowledge that every person contributing to this work has signed the OED Contributing License Agreement and each author is listed in the Description section.

Limitations

None