Use new status icon names (with old icons)

Defining the basic css for status icons here so that themes can just set
colours and add their own icons.
Copy Brazilian Portugese to Portugal Portugese
Latest translations from Transifex.
Add upgrade notes for anti-spam honeypot
Add min-height for iframe
Don't use stylesheet_link_tags

There attachments will be cached, so we don't want timestamped references to stylesheets.
Add viewport to head when using responsive styles.
Set height for IE7, don't use min-height for small devices.

IE7 doesn't implement min-height, so force the iframe height. We don't
want to set min-height for mobile as it's just a workaround for
desktop browsers setting a too-small height.
Try a smaller min-height for smaller devices.
Latest strings from Transifex

Fixes bug in Welsh translation - interpolation variable had been translated
Merge branch 'hotfix/0.18.0.12'
Fix purging of non-default locale cached attachments
Whitelist user controller signup params
Merge tag '0.18.0.14' into production

0.18.0.14