Show placeholder on "my videos" page after uploading a video

[mdorferf]

Hi, thank you for the work you put into Tobira!

During our tests, we noticed the following thing that may confuse users: Users do not receive a status message when they have uploaded a video. This can lead to uncertainty as to whether the video was uploaded correctly. A placeholder would be helpful here (e.g.: video is currently being published) until the video has been successfully uploaded.

Thank you for your help in advance and keep up the great work!

Best regards Maria Dorfer-Frick (TU Wien)