Remove Translational OP

[tommy-waltmann]

Description

This PR removes the translational order parameter, users should use Hexatic instead.

Motivation and Context

This class was deprecated sometime in 2020, but no corresponding issue to remove it was ever created. It should have been removed with the version 3.0.0 release.

How Has This Been Tested?

No new tests are necessary.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds or improves functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation improvement (updates to user guides, docstrings, or developer docs)

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• I have updated the documentation (if relevant).
• I have added tests that cover my changes (if relevant).
• All new and existing tests passed.
• I have updated the credits.
• I have updated the Changelog.