Update citrine_en.txt

[xperrylinn]

Adding Mooney to base units

GEMD Python PR

Description

Please briefly explain the goal of the changes/this PR.
The reviewer should be able to understand why the change is being made by reading this description
and its links (e.g. JIRA tickets).

PR Type:

• Breaking change (fix or feature that would cause existing functionality to change)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Maintenance (non-breaking change to assist developers)

Adherence to team decisions

• I have added tests for 100% coverage
• I have written Numpy-style docstrings for every method and class.
• I have communicated the downstream consequences of the PR to others.
• I have bumped the version in __version__.py

[kroenlein]

Because we're not adding a conversion into another class of viscosity, Pint would behave well if the basis were []. However, in case some other tool assume that equivalent basis means interoperable, I'm conservatively leaving the non-empty basis string.

[kroenlein]

LGTM