Fix the data import and the fixture

apps/core/management/commands/import_old_rp.py

@@ -63,7 +63,7 @@ class Command(BaseCommand):
             # Fetch the article, or creates it
             article = Article.add_new_url(url=item['url'])
             if item['lang'] != "":
-                article.lang = item['lang']
+                article.lang = item['lang'].upper()
             article.published_at = item['date_publi']
             article.title = item['title']