feat: create a Modal to inform the update of terms of service

[dcoa]

Description

This PR creates a new component ModalToS to force a user to accept the terms of service if a change on those has been implemented.

How to test

• Install the component in the environment
• Configure the settings via lms.setting.py

    MFE_CONFIG["MODAL_UPDATE_TERMS_OF_SERVICE"] = {
        "date_iso_8601": "2025-06-08",
        "title": {
            "en": "English modal title",
            "pt-pt": "Portuguese modal title"
        },
        "body": {
            "en": "English modal text",
            "pt-pt": "Portuguese modal text"
        },
        "data_authorization": True,
        "terms_of_service": True,
        "honor_code": True,
    }
 

• Check the modal is being displayed and behave as expected.

[sandroscosta]

Hello @dcoa

I've been reviewing this PR and all looks great. I just have one question regarding the modal, mainly directed to Paragon

Is there a way for us to inject styling into labels? I don't know why there are defined as flexbox, but it creates a weird look when viewing the box on mobile. One solution would be to change the flex direction via a media query, but I guess that everything is tightly coupled with Paragon.

Can you give me some feedback on this? Thanks.

[dcoa]

Hi @sandroscosta , you were right that was a Paragon style issue, I fixed it, could you have a look?

[sandroscosta]

All done! LGTM!