IA-3892: Add a link to login page + better handling back-end translations

[beygorghor]

We need to add a learn more link on login page (linking to https://www.openiaso.com/).
This link should be customizable and not be displayed if unset.

Also Django translations are not well translated.
As used now in python files to return results to the frontend and not only in templates and text, we should improve the translation process and block CI if a translation is missing.

Related JIRA tickets : IA-3892

Self proofreading checklist

• Did I use eslint and black formatters
• Is my code clear enough and well documented
• Are my typescript files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• My migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Doc

• new ENV variable LEARN_MORE_URL
• Translation doc

Changes

• adapt settings.py to avoid errors with LOCALE_PATHS
• wrote a script to make and test messages, using ignored path from a constant
• adding some check on generated .PO files to check if a translation is missing
• checking .po files using output of makemessage
• wrote a script to compile messages using same ignored path as before
• added a new ENV variable LEARN_MORE_URL
• use this var to display or not a learn more link (also logo is a link) on the login page
• modify automated tests to use those new scripts and fail if a translation is issing
• adapt scss to make it pretty
• adapt cypress tests

How to test

• run python manage.py make_translations to generate .po files locally and run checks, it should pass

• run python manage.py compile_translations to compile message

• add LEARN_MORE_URL="https://www.openiaso.com/" to your .env file

• go to login page, the link at the bottom should be visible and translated

• logo should be clickable

• remove the var, no more link or clickable logo

Edit ne of the .po file and delete one translation. Rerun python manage.py make_translations, it should fail

Same is happening on the CI, it's failing with missing translations : https://github.com/BLSQ/iaso/actions/runs/13163991120/job/36739556593

Print screen / video

Notes

Things that the reviewers should know:

• known bugs that are out of the scope of the PR
• other trade-offs that were made
• does the PR depends on a PR in bluesquare-components?
• should the PR be merged into another PR?

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fix: empty instance pop up

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