Added different level of language preference functionaloty which can be
set from the new option in top navigation bar
Lanaguage preference can be set as
* System language (Default for all users)
* Session based (User who are not logged in and want to see they
system in language of their choice can set their preference in browser
session)
* User lever (for authenticated users who have updated their language
preference, system will change into their selected language when they
log into the system)
Fixes main navigation buttons apearence by allowing a 24px margin-bottom attribute.
Temporary cosmetic fix before complete installer revision/overhaul/optimization
Epurates the file, cleaning it from commented-out rules (ugly ones too, they just jad to go heh)
