Jekyll archive link in another language than english - html

Question

I have this code to generate my archive links with Jekyll
<div class="col-lg-4">
<h3>Archives</h3>
<ul>
{% for post in site.posts %}
{% assign thisyear = post.date | date: "%B %Y" %}
{% assign prevyear = post.previous.date | date: "%B %Y" %}
{% assign counter = counter | plus: 1 %}
{% if thisyear != prevyear %}
<li>{{ thisyear }} ({{ counter }})</li>
{% assign counter = 0 %}
{% endif %}
{% endfor %}
</ul>
</div>
As you can see it will render something like "May 2015 (3)". I'm trying to achieve something like "Mai 2015 (3)".
Here is how it's done for a simpler loop :
<div class="col-lg-4">
<h3>Derniers articles</h3>
<ul class="posts">
{% for post in site.posts limit:10 %}
<li>
<span>
{{ post.date | date: '%d' }}
{% assign m = post.date | date: "%-m" %}
{% case m %}
{% when '1' %}janvier
{% when '2' %}février
{% when '3' %}mars
{% when '4' %}avril
{% when '5' %}mai
{% when '6' %}juin
{% when '7' %}juillet
{% when '8' %}août
{% when '9' %}septembre
{% when '10' %}octobre
{% when '11' %}novembre
{% when '12' %}décembre
{% endcase %}
{{ post.date | date: '%Y' }}
</span> »
<a href="{{ BASE_PATH }}{{ post.url }}">
{{ post.title }}</a>
</li>
{% endfor %}
</ul>
</div>
This code will render "15 janvier 2015" for instance instead of "15 january 2015".
Up to now I did not manage to merge the two loops to create what I want to achieve. Any idea ?
EDIT
Made some progress with that code :
But there is a big problem, it will only render one month instead of all months.
So for now it renders
Mai 2015 (4)
instead of
Mai 2015 (1)
Juin 2015 (1)
Juillet 2015 (2)
<ul>
{% for post in site.posts %}
{% assign thisyear = post.date | date: "%Y" %}
{% assign prevyear = post.previous.date | date: "%Y" %}
{% assign m = post.date | date: "%-m" %}
{% assign counter = counter | plus: 1 %}
{% if thisyear != prevyear %}
<li><a href="/archive/#{{ post.date | date:"%B %Y" | }}">{% case m %}
{% when '1' %}janvier
{% when '2' %}février
{% when '3' %}Mars
{% when '4' %}avril
{% when '5' %}mai
{% when '6' %}juin
{% when '7' %}juillet
{% when '8' %}août
{% when '9' %}septembre
{% when '10' %}octobre
{% when '11' %}novembre
{% when '12' %}décembre
{% endcase %}{{ thisyear }} ({{ counter }})</a></li>
{% assign counter = 0 %}
{% endif %}
{% endfor %}
</ul>

Answer 1

With {% if thisyear != prevyear %}, you're grouping by year only.
You need to group by month and year.
You print IF :
not same month (thismonth != prevmonth)
OR same month but not same year (thisyear != prevyear and thismonth == prevmonth)
This works :
<ul>
{% for post in site.posts %}
{% assign thisyear = post.date | date: "%Y" %}
{% assign thismonth = post.date | date: "%-m" %}
{% assign prevyear = post.previous.date | date: "%Y" %}
{% assign prevmonth = post.previous.date | date: "%-m" %}
{% assign counter = counter | plus: 1 %}
{% if (thismonth != prevmonth) or (thisyear != prevyear and thismonth == prevmonth) %}
<li><a href="/archive/#{{ post.date | date:"%B %Y" | }}">
{% case thismonth %}
[ month in french here ]
{% endcase %}
{{ thisyear }} ({{ counter }})
</a></li>
{% assign counter = 0 %}
{% endif %}
{% endfor %}
</ul>