fix(types): add missing locale code for Tajik lang

[root5427]

Types of changes

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

Description

Adds locale code for Tajik language. Tajik language is listed in i18n plugin's locale list, but not added to the corresponding type.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

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