Add basic support for multilingual site

Add language switcher on the top right of the site
Switches taxonomies, article paths, home, etc.
Every language is independent

templates/index_macros.html

@@ -58,7 +58,11 @@
         <div class="container">
             <div class="navbar-brand">
                 {% if config.extra.zulma_brand %}
+                {% if config.default_language is matching(lang) %}
                 <a class="navbar-item" href="/">
+                {% else %}
+                <a class="navbar-item" href="{{"/" ~ lang ~ "/"}}">
+                {% endif %}
                     {% if config.extra.zulma_brand.image %}
                     <img src="{{ config.extra.zulma_brand.image | safe | replace(from="$BASE_URL", to=config.base_url) }}"
                         alt="{{ config.extra.zulma_brand.text }}">
@@ -77,11 +81,17 @@
                 <div class="navbar-end">
                     {% if config.extra.zulma_menu %}
                     {% for item in config.extra.zulma_menu %}
-                    {% set item_url =  item.url | replace(from="$BASE_URL", to=config.base_url) %}
+
+                    {% if config.default_language is matching(lang) %}
+                        {% set item_url =  item.url | replace(from="$BASE_URL", to=config.base_url) %}
+                    {% else %}
+                        {% set item_url =  item.url | replace(from="$BASE_URL", to=config.base_url ~ "/" ~ lang) %}
+                    {% endif %}
+
                     {% set item_url = item_url ~ "/" %}
                     <a itemprop="url"
                         class="navbar-item {% if item_url == current_url %}is-active{% endif %}"
-                        href="{{ item.url | safe | replace(from="$BASE_URL", to=config.base_url) }}">
+                        href="{{ item_url }}">
                         <span itemprop="name">{{ item.name }}
                         </span>
                     </a>
@@ -97,6 +107,36 @@
                         </div>
                     </div>
                     {% endif %}
+
+                    {% if config.languages %}
+                    {% if config.default_language is not matching(lang) %}
+                    {% set lang_url = current_url | replace(from=config.base_url ~ "/" ~ lang, to=config.base_url) %}
+                    <a itemprop="url"
+                        class="navbar-item {% if lang_url == current_url %}is-active{% endif %}"
+                        href="{{ lang_url }}">
+                        <span itemprop="name">{{ config.default_language }}
+                        </span>
+                    </a>
+                    {% endif %}
+                    {% for available_lang in config.languages %}
+                    {% set lang_code = available_lang.code %}
+                    {% if lang_code is not matching(lang) %}
+
+                    {% if lang is matching(config.default_language) %}
+                        {% set lang_url = current_url | replace(from=config.base_url ~ "/", to=config.base_url ~ "/" ~ lang_code ~ "/") %}
+                    {% else %}
+                        {% set lang_url = current_url | replace(from=config.base_url ~ "/" ~ lang, to=config.base_url ~ "/" ~ lang_code) %}
+                    {% endif %}
+                    <a itemprop="url"
+                        class="navbar-item {% if lang_url == current_url %}is-active{% endif %}"
+                        href="{{ lang_url }}">
+                        <span itemprop="name">{{ lang_code }}
+                        </span>
+                    </a>
+                    {% endif %}
+                    {% endfor %}
+                    {% endif %}
+
                 </div>
             </div>
         </div>

templates/post_macros.html

@@ -93,7 +93,7 @@
 {% if page.taxonomies.authors %}
 by
 {% for author in page.taxonomies.authors %}
-<a href="{{ get_taxonomy_url(kind="authors", name=author) | safe }}">
+<a href="{{ get_taxonomy_url(kind="authors", name=author, lang=page.lang) | safe }}">
     <span class="tag is-primary">{{ author }} </span>
 </a>
 {% if page.taxonomies.authors | length > 1 %}
@@ -113,7 +113,7 @@ and
 {% macro post_footer_categories(page) %}
 {% if page.taxonomies.categories %}
 {% set category = page.taxonomies.categories[0] %}
-in <a href="{{ get_taxonomy_url(kind="categories", name=category) | safe }}">
+in <a href="{{ get_taxonomy_url(kind="categories", name=category, lang=page.lang) | safe }}">
     <span class="tag is-success">
         {{ category }}
     </span>
@@ -126,7 +126,7 @@ in <a href="{{ get_taxonomy_url(kind="categories", name=category) | safe }}">
 {% if page.taxonomies.tags %}
 and tagged
 {% for tag in page.taxonomies.tags %}
-<a href="{{ get_taxonomy_url(kind="tags", name=tag) | safe }}">
+<a href="{{ get_taxonomy_url(kind="tags", name=tag, lang=page.lang) | safe }}">
     <span class="tag is-link">{{ tag }} </span>
 </a>
 {% if page.taxonomies.tags | length > 1 %}