Note: The changes in this PR are entirely AI-authored but manually reviewed and tested
## Summary
Translate the remaining French prose and French-derived identifiers in the main FreshRSS/Minz codebase to English.
Why: helps to understand the code
## Scope
- Minz comments, PHPDoc, and paginator identifiers
- Application comments and related identifiers
- Installer database identifiers
- Theme metadata descriptions and the identified CSS comments, previous discussion: https://github.com/FreshRSS/FreshRSS/pull/8241#discussion_r2553181653
- Related call sites and view helpers
External libraries and intentional i18n/docs content are excluded.
* less buttons on step 1
* add form-group
* jump to next step as link not as button
* improve navigation bar HTML structure
* sync password-show button with extra.js
* fix CSS
* i18n: step 4: split text strings for help text (max chars default user)
* show menu button if mobile view
* improve header layout with empty div
* step 5: button in form-actions
* improve buttons in goup-controls
* Favicon added
* Button: Font color hover btn-attention
* install check step: add subtitles
* fix .btn
* improve tabindex
* improve showPW_this()
* Update Travis line length
* Also check whitespace in CSS files
* Fix line length ext.php
* More syntax, string templates
* Fix exclude-pattern
* Test JS files as well
Inverle