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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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14
app/presentation/templates/pages/about.html
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@@ -1,26 +1,26 @@
{% extends "base.html" %}
{% block title %}About - Blog{% endblock %}
{% block meta_description %}A modern blog built with FastAPI and DDD architecture.{% endblock %}
{% block title %}{{ _('about.title', current_locale) }} - {{ _('base.default_title', current_locale) }}{% endblock %}
{% block meta_description %}{{ _('about.description', current_locale) }}{% endblock %}
{% block content %}
<div class="page-header" data-testid="page-header-about">
<h1 class="page-title" data-testid="page-title-about">About</h1>
<h1 class="page-title" data-testid="page-title-about">{{ _('about.page_title', current_locale) }}</h1>
</div>
<div class="card" data-testid="about-card">
<div class="card-body" data-testid="about-card-body">
<p data-testid="about-description">
A modern blog built with FastAPI and Domain-Driven Design architecture.
{{ _('about.description', current_locale) }}
</p>
<div class="divider" data-testid="about-divider"></div>
<p data-testid="about-user">
{% if user %}
Signed in as <strong>{{ user.username }}</strong>.
{{ _('about.signed_in', current_locale).format(username=user.username) }}
{% else %}
You are browsing as a guest.
{{ _('about.browsing_guest', current_locale) }}
{% endif %}
</p>
</div>
@@ -30,7 +30,7 @@
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M10 12L6 8L10 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
Back to Home
{{ _('about.back_home', current_locale) }}
</a>
</div>
</div>

40
app/presentation/templates/pages/index.html
View File

@@ -1,29 +1,29 @@
{% extends "base.html" %}
{% block title %}Blog - Home{% endblock %}
{% block meta_description %}Discover stories, thinking, and expertise from writers on any topic. A modern blog built with FastAPI.{% endblock %}
{% block meta_keywords %}blog, articles, posts, writing, fastapi, python{% endblock %}
{% block title %}{{ _('home.title', current_locale) }}{% endblock %}
{% block meta_description %}{{ _('home.meta_description', current_locale) }}{% endblock %}
{% block meta_keywords %}{{ _('home.meta_keywords', current_locale) }}{% endblock %}
{% block og_type %}website{% endblock %}
{% block og_title %}Blog - Home{% endblock %}
{% block og_description %}Discover stories, thinking, and expertise from writers on any topic.{% endblock %}
{% block og_title %}{{ _('home.title', current_locale) }}{% endblock %}
{% block og_description %}{{ _('home.meta_description', current_locale) }}{% endblock %}
{% block twitter_title %}Blog - Home{% endblock %}
{% block twitter_description %}Discover stories, thinking, and expertise from writers on any topic.{% endblock %}
{% block twitter_title %}{{ _('home.title', current_locale) }}{% endblock %}
{% block twitter_description %}{{ _('home.meta_description', current_locale) }}{% endblock %}
{% block content %}
<section class="page-header" data-testid="page-header-home">
<div class="page-header-flex">
<div data-testid="page-header-content">
<h1 class="page-title" data-testid="page-title-home">Latest Posts</h1>
<p class="page-subtitle" data-testid="page-subtitle-home">Discover stories, thinking, and expertise from writers on any topic.</p>
<h1 class="page-title" data-testid="page-title-home">{{ _('home.page_title', current_locale) }}</h1>
<p class="page-subtitle" data-testid="page-subtitle-home">{{ _('home.page_subtitle', current_locale) }}</p>
</div>
{% if can_create %}
<a href="/web/posts/new" class="btn btn-primary" data-testid="btn-create-post-header">
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M8 2v12M2 8h12" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
Write a Post
{{ _('home.write_post', current_locale) }}
</a>
{% endif %}
</div>
@@ -38,9 +38,9 @@
<a href="/web/posts/{{ post.slug }}" data-testid="post-title-link-{{ post.id }}">{{ post.title }}</a>
</h2>
{% if post.published %}
<span class="badge badge-success" data-testid="post-status-{{ post.id }}">Published</span>
<span class="badge badge-success" data-testid="post-status-{{ post.id }}">{{ _('home.status_published', current_locale) }}</span>
{% else %}
<span class="badge" data-testid="post-status-{{ post.id }}">Draft</span>
<span class="badge" data-testid="post-status-{{ post.id }}">{{ _('home.status_draft', current_locale) }}</span>
{% endif %}
</div>
@@ -65,7 +65,7 @@
{% endfor %}
</div>
<a href="/web/posts/{{ post.slug }}" class="btn btn-sm" data-testid="btn-read-more-{{ post.id }}">
Read more
{{ _('home.read_more', current_locale) }}
<svg width="14" height="14" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-left: 0.25rem;">
<path d="M6 12L10 8L6 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
@@ -77,26 +77,26 @@
<nav class="pagination" data-testid="pagination" aria-label="Pagination">
{% if has_prev %}
<a href="{{ request.url.path }}?page={{ current_page - 1 }}" class="pagination-item" data-testid="pagination-prev">Previous</a>
<a href="{{ request.url.path }}?page={{ current_page - 1 }}" class="pagination-item" data-testid="pagination-prev">{{ _('home.pagination_previous', current_locale) }}</a>
{% else %}
<span class="pagination-item disabled" data-testid="pagination-prev">Previous</span>
<span class="pagination-item disabled" data-testid="pagination-prev">{{ _('home.pagination_previous', current_locale) }}</span>
{% endif %}
<span class="pagination-item active" data-testid="pagination-current">{{ current_page }}</span>
{% if has_next %}
<a href="{{ request.url.path }}?page={{ current_page + 1 }}" class="pagination-item" data-testid="pagination-next">Next</a>
<a href="{{ request.url.path }}?page={{ current_page + 1 }}" class="pagination-item" data-testid="pagination-next">{{ _('home.pagination_next', current_locale) }}</a>
{% else %}
<span class="pagination-item disabled" data-testid="pagination-next">Next</span>
<span class="pagination-item disabled" data-testid="pagination-next">{{ _('home.pagination_next', current_locale) }}</span>
{% endif %}
</nav>
{% else %}
<div class="empty-state" data-testid="empty-state">
<div class="empty-state-icon" data-testid="empty-state-icon">📝</div>
<h3 data-testid="empty-state-title">No posts yet</h3>
<p data-testid="empty-state-description">Be the first to write a post!</p>
<a href="/web/posts/new" class="btn btn-primary" data-testid="btn-create-first-post">Create your first post</a>
<h3 data-testid="empty-state-title">{{ _('home.empty_title', current_locale) }}</h3>
<p data-testid="empty-state-description">{{ _('home.empty_description', current_locale) }}</p>
<a href="/web/posts/new" class="btn btn-primary" data-testid="btn-create-first-post">{{ _('home.empty_action', current_locale) }}</a>
</div>
{% endif %}
{% endblock %}

22
app/presentation/templates/pages/post_detail.html
View File

@@ -29,9 +29,9 @@
{{ post.created_at.strftime('%B %d, %Y') }}
</span>
{% if post.published %}
<span class="badge badge-success" data-testid="post-detail-status">Published</span>
<span class="badge badge-success" data-testid="post-detail-status">{{ _('post.status_published', current_locale) }}</span>
{% else %}
<span class="badge" data-testid="post-detail-status">Draft</span>
<span class="badge" data-testid="post-detail-status">{{ _('post.status_draft', current_locale) }}</span>
{% endif %}
</div>
</header>
@@ -54,26 +54,26 @@
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M10 12L6 8L10 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
Back to posts
{{ _('post.back_to_posts', current_locale) }}
</a>
{% if can_edit or can_delete %}
<div class="flex gap-2" data-testid="post-detail-edit-actions">
{% if can_edit %}
<a href="/web/posts/{{ post.slug }}/edit" class="btn" data-testid="btn-edit-post">
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M11 2L14 5M2 14L3 10L12 1L15 4L6 13L2 14Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
Edit
</a>
<a href="/web/posts/{{ post.slug }}/edit" class="btn" data-testid="btn-edit-post">
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M11 2L14 5M2 14L3 10L12 1L15 4L6 13L2 14Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
{{ _('post.edit', current_locale) }}
</a>
{% endif %}
{% if can_delete %}
<form action="/web/posts/{{ post.slug }}/delete" method="POST" style="display: inline;" data-testid="form-delete-post">
<button type="submit" class="btn btn-danger" data-testid="btn-delete-post" onclick="return confirm('Are you sure you want to delete this post?');">
<button type="submit" class="btn btn-danger" data-testid="btn-delete-post" onclick="return confirm('{{ _('post.delete_confirm', current_locale) }}');">
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M2 4h12M6 4V2a2 2 0 012-2h0a2 2 0 012 2v2m3 0v10a2 2 0 01-2 2H5a2 2 0 01-2-2V4h9z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
Delete
{{ _('post.delete', current_locale) }}
</button>
</form>
{% endif %}

30
app/presentation/templates/pages/post_form.html
View File

@@ -1,6 +1,6 @@
{% extends "base.html" %}
{% block title %}{% if is_edit %}Edit Post{% else %}New Post{% endif %} - Blog{% endblock %}
{% block title %}{% if is_edit %}{{ _('post_form.title_edit', current_locale) }}{% else %}{{ _('post_form.title_new', current_locale) }}{% endif %} - {{ _('base.default_title', current_locale) }}{% endblock %}
{% block extra_css %}
<link rel="stylesheet" href="/static/css/easymde.min.css" data-testid="easymde-stylesheet">
@@ -9,7 +9,7 @@
{% block content %}
<section class="page-header" data-testid="page-header-form">
<h1 class="page-title" data-testid="page-title-form">
{% if is_edit %}Edit Post{% else %}Create New Post{% endif %}
{% if is_edit %}{{ _('post_form.page_title_edit', current_locale) }}{% else %}{{ _('post_form.page_title_new', current_locale) }}{% endif %}
</h1>
</section>
@@ -22,7 +22,7 @@
<div class="card-body" data-testid="form-post-body">
<div class="form-group" data-testid="form-group-title">
<label for="title" class="form-label form-label-required" data-testid="label-title">
Title
{{ _('post_form.label_title', current_locale) }}
</label>
<input
type="text"
@@ -30,31 +30,31 @@
name="title"
class="input input-lg"
value="{% if post %}{{ post.title }}{% endif %}"
placeholder="Enter post title"
placeholder="{{ _('post_form.placeholder_title', current_locale) }}"
required
data-testid="input-title"
>
<span class="form-hint" data-testid="hint-title">A catchy title for your post</span>
<span class="form-hint" data-testid="hint-title">{{ _('post_form.hint_title', current_locale) }}</span>
</div>
<div class="form-group" data-testid="form-group-content">
<label for="content" class="form-label form-label-required" data-testid="label-content">
Content
{{ _('post_form.label_content', current_locale) }}
</label>
<textarea
id="content"
name="content"
rows="12"
placeholder="Write your post content here..."
placeholder="{{ _('post_form.placeholder_content', current_locale) }}"
required
data-testid="textarea-content"
>{% if post %}{{ post.content }}{% endif %}</textarea>
<span class="form-hint" data-testid="hint-content">The main content of your post. Markdown is supported.</span>
<span class="form-hint" data-testid="hint-content">{{ _('post_form.hint_content', current_locale) }}</span>
</div>
<div class="form-group" data-testid="form-group-tags">
<label for="tags" class="form-label" data-testid="label-tags">
Tags
{{ _('post_form.label_tags', current_locale) }}
</label>
<input
type="text"
@@ -62,10 +62,10 @@
name="tags"
class="input"
value="{% if post %}{{ post.tags|join(', ') }}{% endif %}"
placeholder="python, fastapi, tutorial"
placeholder="{{ _('post_form.placeholder_tags', current_locale) }}"
data-testid="input-tags"
>
<span class="form-hint" data-testid="hint-tags">Comma-separated list of tags</span>
<span class="form-hint" data-testid="hint-tags">{{ _('post_form.hint_tags', current_locale) }}</span>
</div>
</div>
@@ -73,15 +73,15 @@
<div class="card-footer" data-testid="form-post-footer">
<div class="flex justify-between items-center" data-testid="form-actions">
<a href="{% if is_edit %}/web/posts/{{ post.slug }}{% else %}/web/{% endif %}" class="btn" data-testid="btn-cancel">
Cancel
{{ _('post_form.cancel', current_locale) }}
</a>
<div class="flex gap-2" data-testid="form-submit-actions">
<button type="submit" name="action" value="draft" class="btn" data-testid="btn-save-draft">
Save as Draft
{{ _('post_form.save_draft', current_locale) }}
</button>
<button type="submit" name="action" value="publish" class="btn btn-primary" data-testid="btn-publish-post">
{% if is_edit %}Update Post{% else %}Publish Post{% endif %}
{% if is_edit %}{{ _('post_form.update_post', current_locale) }}{% else %}{{ _('post_form.publish_post', current_locale) }}{% endif %}
</button>
</div>
</div>
@@ -99,7 +99,7 @@
spellChecker: false,
status: false,
minHeight: '300px',
placeholder: 'Write your post content here...',
placeholder: '{{ _('post_form.placeholder_content', current_locale) }}',
toolbar: [
'bold', 'italic', 'heading', '|',
'code', 'quote', 'unordered-list', 'ordered-list', '|',

14
app/presentation/templates/pages/profile.html
View File

@@ -4,7 +4,7 @@
{% block content %}
<div class="page-header" data-testid="page-header-profile">
<h1 class="page-title" data-testid="page-title-profile">User Profile</h1>
<h1 class="page-title" data-testid="page-title-profile">{{ _('profile.title', current_locale) }}</h1>
</div>
<div class="card" data-testid="profile-card">
@@ -25,18 +25,18 @@
<div class="profile-details" data-testid="profile-details">
<div class="profile-field" data-testid="profile-field-email">
<span class="profile-label" data-testid="profile-label-email">Email:</span>
<span class="profile-value" data-testid="profile-value-email">{{ user.email or 'Not provided' }}</span>
<span class="profile-label" data-testid="profile-label-email">{{ _('profile.email', current_locale) }}</span>
<span class="profile-value" data-testid="profile-value-email">{{ user.email or _('profile.not_provided', current_locale) }}</span>
</div>
<div class="profile-field" data-testid="profile-field-userid">
<span class="profile-label" data-testid="profile-label-userid">User ID:</span>
<span class="profile-label" data-testid="profile-label-userid">{{ _('profile.user_id', current_locale) }}</span>
<span class="profile-value" data-testid="profile-value-userid">{{ user.user_id }}</span>
</div>
{% if user.first_name or user.last_name %}
<div class="profile-field" data-testid="profile-field-name">
<span class="profile-label" data-testid="profile-label-name">Name:</span>
<span class="profile-label" data-testid="profile-label-name">{{ _('profile.name', current_locale) }}</span>
<span class="profile-value" data-testid="profile-value-name">
{{ user.first_name or '' }} {{ user.last_name or '' }}
</span>
@@ -51,7 +51,7 @@
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M10 12L6 8L10 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
Back to Home
{{ _('profile.back_home', current_locale) }}
</a>
{% if can_create %}
@@ -59,7 +59,7 @@
<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
<path d="M8 2v12M2 8h12" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
New Post
{{ _('profile.new_post', current_locale) }}
</a>
{% endif %}
</div>