Adding a way to set the vexip-ui locale used in nuxt.config.ts

[Nalca]

Description

As a developper using vexip-ui/nuxt, I want to be able to :

• Set the initial locale by vexip-ui in nuxt.config.ts
• Change the locale used by vexip-ui via a helper (Since we don't have access to app)

Why ? Because otherwise, we have to place a config-provider at the root of the app to provide the locale. I placed mine in app.vue, but it feel king of messy.

Suggested solution

• Add an option called "initialLocale" to the module, so we can pass a locale to vexip without having to use a config-provider.
• Add a helper function to change the locale, for the same reason.

Alternative

Add documentation about how to setup a config-provider in app.vue, or any cleaner solutions.

Additional context

No response

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.