i18n: First attempt at right-to-left layout

css/rtl.css

include/class.i18n.php

include/i18n/langs.php

include/staff/apikeys.inc.php

include/staff/banlist.inc.php

include/staff/cannedresponses.inc.php

include/staff/categories.inc.php

include/staff/departments.inc.php

include/staff/directory.inc.php

include/staff/dynamic-form.inc.php

include/staff/dynamic-forms.inc.php

include/staff/dynamic-lists.inc.php

include/staff/emails.inc.php

include/staff/faq-categories.inc.php

include/staff/faq-category.inc.php

include/staff/faq-view.inc.php

include/staff/filter.inc.php

include/staff/filters.inc.php

include/staff/groups.inc.php

include/staff/header.inc.php