Handle RSpec description with japanese char in CP932 encoded files

Created by: benoittgt

When the user create a test with CP932 encoding and japanese chars RSpec fail to properly display characters or crash with the error:

Encoding::CompatibilityError: incompatible character encodings: Windows-31J and UTF-8

Fix:

• https://github.com/rspec/rspec-core/issues/2570
• https://github.com/rspec/rspec-core/issues/2543