GitLab

Steps:

1. Go to "https://sandbox.genesys-pgr.org/admin/content" as admin user;
2. Click "+" button;
3. Enter to the "Slug" field "test";
4. Enter to the "Language" field "en";
5. Click "Back to article list";
6. Click "+" button;
7. Enter to the "Slug" field "test";
8. Enter to the "Language" field "en";
9. Click "Back to article list";
10. Try to open one of created article;

or you can open "https://sandbox.genesys-pgr.org/admin/content/v2LYA5yzWq8" as admin and try to open one of articles;

Expected result: User cann`t create two or more same articles. When user try to create article which already exist he should see snack bar "Article should be unique" or something like this;

Actual result: User can create two or more same articles. Also if user try to open one of them request failed with status code 500;