Update dependency @ngx-translate/core to v18

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@ngx-translate/core	17.0.0 → 18.0.0

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Release Notes

ngx-translate/core (@​ngx-translate/core)

v18.0.0

Compare Source

@ngx-translate/core@18.0.0 and @ngx-translate/http-loader@18.0.0 are now stable on npm (latest).

v18 is the major API-cleanup release: standalone providers everywhere, signal-based internals, the default → fallback rename finalized, and the deprecated surface removed. It also resolves three long-standing semantic gotchas and baselines the workspace on Angular 22 / TypeScript 6.0.

Highlights

• Standalone-first setup. TranslateModule is gone — use provideTranslateService() / provideChildTranslateService() (works in standalone and NgModule apps).
• New *translateBlock="let t" structural directive for cleaner template translations.
• New isLoading: Signal<boolean> — true while any use() load is in flight; read it for language-switching spinners.
• Isolated subtrees are now truly isolated — own events, lookups, and language state.
• Angular 18–22 supported (16 and 17 dropped); built and tested against Angular 18/19/20/21/22.

Breaking changes — required edits

TranslateModule removed. Replace TranslateModule.forRoot({...}) / forChild({...}) with provideTranslateService({...}) / provideChildTranslateService({...}). The pipe, directive, and service are standalone.

Deprecated default* symbols removed — rename:

Removed	Replacement
defaultLang	fallbackLang
setDefaultLang()	setFallbackLang()
getDefaultLang()	getFallbackLang()
onDefaultLangChange	onFallbackLangChange
DefaultLangChangeEvent	FallbackLangChangeEvent
langs	getLangs()
setValue() (util)	insertValue()

Also removed: useDefaultLang and defaultLanguage config fields (along with TranslateModule).

Deprecated (still works, warns once): using element text content as a key (<span translate>Hello</span>). Use [translate]="'KEY'", the translate pipe, or *translateBlock. It will be removed next major.

Potentially breaking — low impact (behavior changes)

• A failed use() no longer mutates state. On loader failure, currentLang() / lastUseLanguage stay at the prior value instead of switching to the failed language. Use isLoading() or the returned Observable's error channel to drive switching UI.
• Isolated subtrees no longer see ancestor translationChange$ events, nor borrow keys from outer scopes. Isolation now means own events + own lookups + own language state. If you wanted shared translations with subtree-scoped state, use provideChildTranslateService({ extend: true }).
• instant() "unloaded language" warning is deduplicated per isolated subtree (was once per service instance).
• ITranslateService gains isLoading: Signal<boolean>. If you mock it via implements/extends ITranslateService, add isLoading = signal(false).asReadonly(). See the "Mocking TranslateService" recipe in the README.
• Loader errors are now logged instead of silently swallowed.

Migration

Full step-by-step guide: https://ngx-translate.org → Getting Started → Migration Guide.

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Angular compatibility: 18, 19, 20, 21, 22 · TypeScript: 6.0 · RxJS: ≥7

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