Update en-GB.plg_system_tfa.ini
Merge https://github.com/readybytes/Two-Factor-Authentication
Merge branch 'master' of https://github.com/readybytes/Two-Factor-Authentication

Added new template watchfully.

Conflicts:
	tfa/languages/en-GB.plg_system_tfa.ini
Improvement::

1. More validation added.
2. Formating language-file.
3. Hide extra stuff (will provide in next iteration).
4. Clean language code. (Thanks to Adam Przybylski)
Merge pull request #47 from mManishTrivedi/master

Merger from Manish-Repo