Update dependency react-i18next to v15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-i18next	^14.1.0 -> ^15.0.0

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Release Notes

i18next/react-i18next (react-i18next)

v15.1.3

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• fix: Self-closing REACT components in translation strings should not attempt to replace the component's children 1815 1816

v15.1.2

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• fix: Attempted to assign to readonly property 1813

v15.1.1

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• fix: Not all namespaces are loaded when passing the lng option to useTranslate 1809

v15.1.0

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• fix: <Trans /> warns 'Each child in a list should have a unique "key" prop.' for react 19 1806

v15.0.3

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• try to fix unexpected token issue

v15.0.2

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• try to fix Trans handling with alwaysFormat set to true 1801

v15.0.1

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• revert arrow function in class property to address this

v15.0.0

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• use optional chaining, nullish coalescing and nullish coalescing assignment 1774
• Build config and optimizations 1769
• some dependency updates 1768
• use modern hasLoadedNamespace code (now requires at least i18next > v19.4.5 (introduced in june 2020))

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