Show environment info always in en_US

- The environment info is used mainly when discussing about bugs and other
core-related things.
- Furthermore it contains quite technical info, so we assume that
technician are familiar with English.
- Finally the strings to be translated are quite hard to translate for
translators that don't have a sufficient technical knowledge.
Merge pull request #1368 from mlocati/environment-info-always-in-english

Show environment info always in en_US