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feat(i18n): add browser-language localization with Jinja2 _() and locale middleware
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Add i18n support to the blog web UI with 4 languages (en/ru/fr/de),
80 translation keys, automatic Accept-Language detection, persistent
locale cookie, and a language switcher dropdown in the header.

- Infrastructure: TranslationService, translation dicts, convenience _()
- Presentation: locale middleware, /web/lang/{locale} switcher route
- Templates: all 9 templates use {{ _(key, current_locale) }}
- Tests: 26 tests across TranslationService, locale detection helpers
- Docs: TEST_MODEL.md and FEATURE_INFRASTRUCTURE.md updated with TC-UNIT-811-821
This commit is contained in:
Сергей Ванюшкин
2026-05-10 16:22:06 +03:00
parent 4e6505c598
commit d32ad29abc
18 changed files with 1077 additions and 100 deletions
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12
app/presentation/templates/base.html
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@@ -1,11 +1,11 @@
<!DOCTYPE html>
<html lang="en" data-testid="html-root">
<html lang="{{ current_locale }}" data-testid="html-root">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="{% block meta_description %}Blog - A modern blogging platform built with FastAPI{% endblock %}">
<meta name="keywords" content="{% block meta_keywords %}blog, articles, posts, writing{% endblock %}">
<meta name="author" content="{% block meta_author %}Blog Team{% endblock %}">
<meta name="description" content="{% block meta_description %}{{ _('base.meta_description', current_locale) }}{% endblock %}">
<meta name="keywords" content="{% block meta_keywords %}{{ _('base.meta_keywords', current_locale) }}{% endblock %}">
<meta name="author" content="{% block meta_author %}{{ _('base.meta_author', current_locale) }}{% endblock %}">
<meta name="robots" content="{% block meta_robots %}index, follow{% endblock %}">
<!-- Canonical URL -->
@@ -30,7 +30,7 @@
<link rel="icon" type="image/svg+xml" href="/static/images/favicon.svg">
<link rel="alternate icon" href="/static/images/favicon.ico">
<title data-testid="page-title">{% block title %}Blog{% endblock %}</title>
<title data-testid="page-title">{% block title %}{{ _('base.default_title', current_locale) }}{% endblock %}</title>
<link rel="stylesheet" href="/static/css/themes/theme-light.css" data-testid="theme-light-stylesheet">
<link rel="stylesheet" href="/static/css/themes/theme-dark.css" data-testid="theme-dark-stylesheet">
@@ -51,7 +51,7 @@
{% for msg in flash_messages %}
<div class="flash-message flash-{{ msg.category }}" data-testid="flash-message-{{ msg.category }}" role="alert">
<span class="flash-text" data-testid="flash-text">{{ msg.message }}</span>
<button type="button" class="flash-close" data-testid="flash-close" aria-label="Close message">&times;</button>
<button type="button" class="flash-close" data-testid="flash-close" aria-label="{{ _('base.close_message', current_locale) }}">&times;</button>
</div>
{% endfor %}
</div>