Revert "Rename *device* files to *instance* files"

This reverts commit 6aad950e43e69505e3c1a12147c6af696b160acc.
Revert "Rename *device* files to *instance* files"

This reverts commit bec68bd0fba86fcacddbd118e81d85b9755db8c9.
Revert "Rename Device To Instance in all py files"

This reverts commit 5a281f22776823751398998c2d04db0bc5ad8eea.
Revert "Rename device to instancein all py files"

This reverts commit 44cec58641c5ff73eaee7e3cdeccbbe6756b03a5.
Revert "fixed the device creation page"

This reverts commit c7bfc188ed194c21c12c74e3eec4d1e3b2800087.
Revert "products is not a list anymore but a dictionary"

This reverts commit 7c2aee5fd283ab88c72d4fb21c4e705e4e851638.