Copy to Clipboard in English

Summary:
Add a new button to copy to clipboard in English for usage in bug report. This
doesn't affect existing copy button which copy translated information for usage in local
forum, etc.

Copied example:

Operating System: openSUSE Tumbleweed 20181219
KDE Frameworks Version: 5.53.0
Qt Version: 5.12.0
Kernel Version: 4.19.8-1-default
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4710MQ CPU @ 2.50GHz
Memory: 7.7 GiB

Reviewers: Plasma, ngraham

Reviewed By: ngraham

Subscribers: ngraham, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D17773