After investigations, commit the proposed patch by kklimonda presented with the following introduction : cm/templates/site/login_form.html template uses a relative url for the form action, which seems to break deployment in the subfolder when trailing slash is missing (the form redirects to the upper folder breaking login). Using {% url login %} (as in the attached patch) instead would fix the issue.

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{% extends "email/base_email.txt" %}{% load i18n %}

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{% block content %}

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{% blocktrans %}Your text "{{ title }}" has been created.{% endblocktrans %}

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{% blocktrans %}To publish it click on the following link:{% endblocktrans %}

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{{ site_url }}{{ publish_url }} 

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{% endblock %}