Fix: Nickname export and import
Fixes #355 (closed)
This update will fix the issue where the selected nicks could not be imported to another server. The nickname feature will now directly use the nicknames instead of their IDs in the MongoDB. The IDs were used for security concerns since it is now possible to import nicknames to the quiz which do not exist on the server.
Since the fix where the IDs were translated into the nicknames while exporting and then changed to the IDs on the new server while importing caused another issue and the team relies on this issue been fixed I'd say we can target the security problems in another MR.
Anyway it is important to know that the exported files are corrupted and cannot be restored.