Currently we don't have tags related to a challenge. These tags could help to identify the challenge details by keyword such as targeted conference cvpr2020, neurips2021 etc.

Deliverables

• Add a tags field (postgres array field, default=[], null=True) to Challenges Model
• List tags associated with a challenge on the [challenge list page](https://evalai.cloudcv.org/web/

When you show the achievements or leaderboard activity and click on "settings" in the upper right corner and logoff, you will return to main_activity.xml where the UI still shows you are logged in.

This task is to add a translation using weblate

https://hosted.weblate.org/projects/coala/gci-leaders/

Only one translation should be added at a time, as we will be manually importing the translations until #125 and #124 have been merged.

The entire set of messages for the language should be translated before the task is completed and submitted.

Сделать какие-то пояснения для изменений мест, вызванных изменениями рейтинга других игроков, а не изменением рейтинга самого игрока, страничку которого смотрим.