i18next: support user defined overriden translations for react

[zzacharo]

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• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings (for relevant code).
• I've followed the CSS/JS and React guidelines (for relevant code).
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• I've followed the user interface guidelines (for relevant code).
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