Revert "fix invalid byte sequence in UTF-8"

This reverts commit 90395035992e605157c6ec7714da763f5825ccbe.

Conflicts:

	app/views/operating_systems/show.html.erb
Revert "fix invalid byte sequence in UTF-8"

This reverts commit 90395035992e605157c6ec7714da763f5825ccbe.

Conflicts:

	app/views/operating_systems/show.html.erb