[RW-1134] Show chat popup to anonymous users

[orakili]

Refs: RW-1134

This adds a reliefweb_ai module that currently simply alters the chat form to disable it and show a message to instruct anonymous users log in to use the feature.

This also consolidates the messages shown when the form is disabled (ex: non English, maps etc.).

[github-actions]

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Pusher: @orakili, Action: pull_request, Workflow: Run tests

[orakili]

@attiks Could you check the code related to the caching in that PR and let me know if you think something is off? From my tests that works as expected.

It's been deployed to the demo env, if you want to test as well.

[github-actions]

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