Add en-GB language support for CL

[ZbynekHanak-RWS]

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Purpose

Continuous Localization pipeline settings update.

Declarations

Check these if you believe they are true

• The code base is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• Snapshot of UI changes, if any.

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