🌐 feat(i18n): overhaul translation system & add languages (#145)

Revamp the existing translation system, simplifying
management and adding several new languages. The new system reads from
TOML files in the `/i18n` directory and improves template structures.
It also enhances customisation options and robustness by providing
fallbacks and modularity.

- Implement a new, streamlined translation macro.
- Load translations from `/i18n` TOML files.
- Remove redundant configuration requirements.
- Refactor templates to align with new i18n system.
- Add support for Hindi, Japanese, Russian, Portuguese, Chinese,
  Italian, German, Ukranian, Korean, and French languages.
- Credit Thomas Weitzel (@thomasweitzel) for inspiration.

templates/section.html

@@ -23,12 +23,12 @@
     {% endif -%}
 
 	{% set max = section.extra.max_posts | default(value=999999) %}
-    {{ macros_list_posts::list_posts(posts=pages, max=max) }}
+    {{ macros_list_posts::list_posts(posts=pages, max=max, language_strings=language_strings) }}
 </div>
 </main>
 
 {% if paginator %}
-    {{ macros_paginate::paginate() }}
+    {{ macros_paginate::paginate(language_strings=language_strings) }}
 {% endif %}
 
 {% endblock main_content %}