django-lang

GitHub

Test

Check Demo Project

Check the demo repo on GitHub

Requirements

Python 3.9+ supported.
Django 3.2+ supported.

Setup

Install from pip:
```
pip install django-lang
```

Modify settings.py by adding the app to INSTALLED_APPS:

INSTALLED_APPS = [
    # ...
    "lang",
    # ...
]

Modify settings.py by adding the app to INSTALLED_APPS:

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [os.path.join(PROJECT_DIR, "templates")],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
                "lang.context_processors.from_settings",
                "lang.context_processors.seo_i18n",
            ],
        },
    },
]

Optional: lang.context_processors.language_switcher_next (fills redirect_to for the packaged language form).

Optional: `SetLanguageNextPathMiddleware`

Only needed if you use translated URL segments (gettext_lazy under i18n_patterns) and see language switches that POST to set_language but stay on the wrong prefix. Short how-to: docs/set_language_middleware.md.

Modify your project's base template base.html to include language's switcher styles:

<head>
    ...
    <link rel="stylesheet" type="text/css" href="{% static 'lang/css/nav-link.css' %}">
    ...
</head>

Modify your project's base template base.html to include attributes using translate_url template's tag:

<head>
    ...
    <meta name="language" content="{{ LANGUAGE_CODE }}" />
    {% include "hreflang.html" %}
    ...
</head>

Modify your project's nav template nav.html to include language's switcher:

<nav class="navbar">
    ...
    <ul class="nav navbar-nav">
        {% include "lang/nav-link.html" %}
    </ul>
    ...
</nav>

Configuration: `lang.conf` and `APP_CONFIG`

Built-in maps live in lang.defaults. At runtime, :mod:lang.conf resolves values lazily:

Top-level Django settings (LANGUAGE_HREFLANG_MAP, LANGUAGE_WIKIPEDIA_SAMEAS, OG_LOCALE_BY_LANGUAGE, HREFLANG_DEFAULT_LANGUAGE, LANGUAGE_FLAG_MAP), if set.
Partial dicts under settings.APP_CONFIG["lang"] merged onto the package defaults (for the three LANGUAGE_* / OG_* maps and flag overrides).
Otherwise the content of lang.defaults.

You do not need to import lang.defaults from settings.py. Typical site-only override for x-default::

APP_CONFIG = {
    "lang": {
        "HREFLANG_DEFAULT_LANGUAGE": "it",
    },
}

Or use the usual flat settings (full replacement for the dict keys, or HREFLANG_DEFAULT_LANGUAGE at top level) if you prefer.

Optional: language control beside the hamburger on small viewports

nav-link-standalone.css shows the extra switcher next to the menu toggle below the lg breakpoint (~992px) and hides the duplicate inside the collapsed drawer. Optional script display-standalone-class.js only adds class display-standalone on <html> for installed web apps; layout no longer depends on it.

In settings.py, add the optional context processor so redirect_to is filled for set_language’s next (unless you pass redirect_to from each view):
```
"lang.context_processors.language_switcher_next",
```

In the base layout <head>, after nav-link.css, add:

<link rel="stylesheet" href="{% static 'lang/css/nav-link-standalone.css' %}">
<script src="{% static 'lang/js/display-standalone-class.js' %}"></script>

Next to your mobile menu button, include:

{% include "lang/nav-link-standalone.html" %}

Packaged templates:

hreflang.html (app template root) — <link rel="alternate" hreflang="…"> for the current view.
lang/nav-link.html — language <select> (optional context: lang_switcher_id, lang_switcher_extra_class).
lang/nav-link-standalone.html — duplicate switcher beside the mobile toggle (small viewports / PWA).

Run Example Project

git clone --depth=50 --branch=django-lang https://github.com/DLRSP/example.git DLRSP/example
cd DLRSP/example
python manage.py runserver

Now browser the app @ http://127.0.0.1:8000

References

brainstorm.it - Language's switching
hakibenita.com - Url's translation for "hreflang" html's attributes

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