I take no credit for this product. I just made some modification to be compatible with vBulletin 5.x (If not allowed, please remove the post)
Link to original Author and product:
https://www.vbulletin.org/forum/showthread.php?t=180380

Product Translation Tool

This Add-on allows you to easily create/maintain language packs and has proven its usability for over a year now.

Compatibility
This Add-on is compatible with vBulletin 5.x.

Support
Not available

Language Packs
Same as the other post for vBulletin 4, linked above.