Update dependency i18next to v26

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
i18next (source)	25.10.10 → 26.0.8

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Release Notes

i18next/i18next (i18next)

v26.0.8

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• fix(types): restore the pre-v25.10.4 ExistsFunction shape so plain arrow functions can again be assigned to ExistsFunction-typed variables (TypeScript cannot infer type predicates through multi-overload assignment). Direct i18next.exists(key) calls still narrow key to SelectorKey — the predicate is now declared inline on i18n.exists. Custom wrappers that want the narrowing can type themselves as typeof i18next.exists 2425

v26.0.7

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• fix: when a plural lookup misses, the missingKey debug log now shows the actual plural-resolved key (e.g. foo.bar_many for Polish count: 14) instead of the base key — making it obvious which plural category was expected and missing 2423
• chore: drop @babel/runtime runtime dependency. The build no longer generates any @babel/runtime imports, so the package is unused by consumers. Rollup now uses babelHelpers: 'bundled' so any helpers that are ever needed in the future will be inlined rather than imported externally 2424
• chore: stop emitting dist/esm/i18next.bundled.js. It was byte-identical to dist/esm/i18next.js because no helpers were being imported 2424

v26.0.6

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Security release — all issues found via an internal audit.

• security: warn when a translation string combines escapeValue: false with interpolated variables inside a $t(key, { ... "{{var}}" ... }) nesting-options block. In that narrow combination, attacker-controlled string values containing " can break out of the JSON options literal and inject additional nesting options (e.g. redirect lng/ns). The default escapeValue: true configuration is unaffected because HTML-escaping neutralises the quote before JSON.parse. See the security note in the Nesting docs for the full pattern and mitigations
• security: apply regexEscape to unescapePrefix / unescapeSuffix on par with the other interpolation delimiters. Prevents ReDoS (catastrophic-backtracking) when a misconfigured delimiter contains regex metacharacters, and fixes silent breakage of the {{- var}} syntax when the delimiter contains characters like (, [, .
• security: strip CR/LF/NUL and other C0/C1 control characters from string log arguments to prevent log forging via user-controlled translation keys, language codes, namespaces, or interpolation variable names (CWE-117)
• chore: ignore .env* and *.pem/*.key files in .gitignore

v26.0.5

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• fix: cloneInstance().changeLanguage() no longer fails to update language state when the target language is not yet loaded — a race between init()'s deferred load() and the user's changeLanguage() could overwrite isLanguageChangingTo, causing setLngProps to be skipped 2422

v26.0.4

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v26.0.3

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v26.0.2

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v26.0.1

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v26.0.0

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Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
app/javascript/BuiltInFormControls/AddFileModal.tsx	🔴 0%	🔴 33.33%	🟢 33.33%
app/javascript/BuiltInFormControls/LiquidInput.tsx	🟠 57.5%	🟠 60%	🟢 2.5%
Overall Coverage	🟢 53.07%	🟢 53.1%	🟢 0.03%

Minimum allowed coverage is 0%, this run produced 53.1%