[i18n] New Corrections for RTL UI

[persian-horde@metanetworking.com]

Hello All,

We continue working on correcting UI problems in RTL languages, and we
fixed most of alignments and floats, on Horde Head and IMP Head.

We have also added 4 reversed images for RTL languages for better
appearance, and edit some portions of code to display these reversed
images in RTL languages.

These 4 images are:
rev-user.png
rev-group.png
rev-administration.png
rev-mail_personal.png

The unified diff file and image are available at:
http://www.metanetworking.com/persian-horde/

Thanks
Persian Horde Team