Merge branch 'pre-prod' into 'master'

CHANGELOG_SERVER.md

ubiquity/Makefile

ubiquity/Pipfile

ubiquity/Pipfile.lock

ubiquity/requirements.txt

ubiquity/tutoring/decorators.py

ubiquity/tutoring/filters.py

ubiquity/tutoring/history.py

ubiquity/tutoring/locale/fr/LC_MESSAGES/django.mo

ubiquity/tutoring/locale/fr/LC_MESSAGES/django.po

ubiquity/tutoring/models/indicators/plugins/tokens_number.py

ubiquity/tutoring/models/languages/analyzer.py

...uity/tutoring/static/tutoring/css/bootstrap-table.min.css

...ring/static/tutoring/js/bootstrap-table-locale-all.min.js

ubiquity/tutoring/static/tutoring/js/bootstrap-table.min.js

ubiquity/tutoring/static/tutoring/js/change_chart.js

ubiquity/tutoring/static/tutoring/js/collapse.js

ubiquity/tutoring/static/tutoring/js/raw_number.js

ubiquity/tutoring/static/tutoring/js/refresh-buttons.js

ubiquity/tutoring/static/tutoring/js/refresh.js