Various CSS fixs for RTL languages

colors theme - minor css fix for topmenu to remove horizonal scrollbars
webtrees & xenia redo css for topmenu to remove horizonal scrollbars
webtrees & xenia add css to correctly position icon on 're-order families' menu option
fab & webtrees remove horizontal scrollbars on pedigree chart
pedigree.php temporary fix to remove duplicate scrollbars on chrome, pending proper fix by Google

probably best to apply #201 first