[a0.2] Major stability improvements

Improved:

Our most significant bug at the time is finally solved! We moved our infrastructure successfully and now expect better stability, although we might experience longer installation and test duration. Good trade anyway!
You can finally have a time estimate when running a test or installing Flusk Vault
The progress bar when running a test or installing Flusk Vault is now working again!
The installation page was redesigned to show the progress of your update better
The Current Jobs viewer was redesigned and now shows the progress of jobs among all your apps (not only the current one), more logs and better UI.
Optimised all jobs systems to slow down refresh rate when idle.
Jobs now get an estimated time upfront based on your recent similar jobs (for tests only), other jobs with similar apps, and also in realtime based on the speed of execution.

Bug fix:

Fixed a refreshing bug on the installation page causing an unnecessary huge amount of request to our server and slowing down performance for users.
Fixed texts in notifications "extractions"