Make sure label text is escaped if it is not safe

Signed-off-by: Rafael Mendonça França <rafaelmfranca@gmail.com>
Make sure hint text is escaped if it is not safe

Signed-off-by: Rafael Mendonça França <rafaelmfranca@gmail.com>
Make sure error_prefix option is escaped if it is not safe

Signed-off-by: Rafael Mendonça França <rafaelmfranca@gmail.com>
Release 2.1.1
Merge branch '2-1-1' into v2.1

Conflicts:
	CHANGELOG.md