Auto-format css/js/html and add eslint

[balazs-endresz]

• Are tests passing? (From the root-level of the repository please run pip install tox && tox)
• I have added or updated a test to cover the changes proposed in this Pull Request
• I have updated the documentation to cover the changes proposed in this Pull Request

Tests passed locally with tox and I these shouldn't require any test or docs changes. Also tested manually with the testproject.

---

This PR adds auto formatting with pre-commit for js/css/html, and some minor linting tweaks:

• Fixed flake8 url, which has been changed a while ago from gitlab to github
• Reformatted rosetta.css and rosetta.js with prettier
• Added eslint config (using v8 because couldn't get the newer v9 config working)
• Fixed a few eslint warnings in rosetta.js
• Reformatted django templates with djhtml
• Added trimmed to blocktrans in test.html since the indentation was changed, but I guess this would be done in practice too to ignore the newlines.
• prettier works for yaml files too but not added that here

I tried to stick to the defaults mostly, but I'm happy to redo this with different settings if needed.

[balazs-endresz]

Rebased and added some minor ruff fixes that came up after pre-commit run --all-files. (I guess those went unnoticed after adding ruff because pre-commit checks only modified files by default.)

[mbi]

Hello @balazs-endresz

Trying to run pre-commit yields this error. Could you please provide a minimal config file, ideally as a hidden dotfile in the root of the project?

Oops! Something went wrong! :(

ESLint: 8.56.0

ESLint couldn't find a configuration file. To set up a configuration file for this project, please run:

npm init @eslint/config

ESLint looked for configuration files in /home/marco/Code/django-rosetta/rosetta/static/admin/rosetta/js and its ancestors. If it found none, it then looked in your home directory.

If you think you already have a configuration file or if you need more help, please stop by the ESLint Discord server: https://eslint.org/chat

[balazs-endresz]

Turns out it worked for me because I had a default eslint config file in my home directory. I tried again with eslint version 9 but still couldn't get that working with prettier pre-commit, but at least the older v8 config file should work now with a new .eslintrc.js file added to the first commit.

[mbi]

Thank you, merged!