Enable localization injection from outside for all texts

[fredicious]

Summary

It would be nice to avoid hard-coded English texts, and allow localization.

Examples

example of hard-coded English text: https://github.com/mui/toolpad/blob/master/packages/toolpad-core/src/SignInPage/SignInPage.tsx#L349

Motivation

I am building a dashboard in another language.

Search keywords: localize, translate, lang

[bharatkashyap]

Agreed. A LocaleContext already exists internally and is consumed by the Account and related components: https://mui.com/toolpad/core/react-account/#labels

We can extend the LocaleContextType to include every label across components, and add an optional defaultLocaleText prop on the AppProvider and consume the LocaleContext inside the AppProvider instead of Account.

[Janpot]

We can model it after the X implementation. See https://mui.com/x/react-date-pickers/localization/

@fredicious Which languages did you have in mind and are you open to contribute translations for them?

[gil-obradors]

As it is a first case, if no one else starts working on it, I would take care of it myself, but in two weeks' time.
@Janpot Regardless of who starts the work, once done I can contribute with Spanish and Catalan.

[Alexandre-Voinier-Afleya]

I'm interested by this feature, I can contribute with French.