Fixed nginx configuration, which wasn't working for <base_url>/fr and <base_url>/en.

nginx.conf

 server {
     # staging server is listening on the port 8080
     listen 8080;
-    server_name portail-data;
+    server_name _;
     root /usr/share/nginx/html/;
-    
-    # rule redirecting to fr or en regarding the browser preferences 
+
+    # rule redirecting to fr or en regarding the browser preferences
     location = / {
         rewrite_by_lua '
         for lang in (ngx.var.http_accept_language .. ","):gmatch("([^,]*),") do
@@ -20,12 +20,12 @@ server {
     }
 
     # This is needed to allow reloading in the app when not on the base url as our app is an SPA
-    location /en/ {
-        try_files $uri$args $uri/ /en/index.html;
+    location /en {
+        try_files $uri$args /en/index.html;
     }
 
-    location /fr/ {
-        try_files $uri$args $uri/ /fr/index.html;
+    location /fr {
+        try_files $uri$args /fr/index.html;
     }
 
 }