Fix: Improve sorter placement algorithm

[nielslyngsoe]

A few different fixes that was a bit related. Generally this improves the sorting algorithm, so it is much more intuitive where things gets dropped. Especially for Block Grid Editor, where the drag n' drop feature is very important.

Fixes #17798
Fixes #17967

This contains:

• Fixes for the placement algorithm for Sorter.
• Makes Confirm Modal localizable.
• Fixes Block Type Input so it works when deleting and moving Blocks, generally made it much simpler.