Slide from right transition in rtl languages

[Roman Sorokin]

Hi,

I use "slide-from-right" transition "for core-animated-pages". And I want it in rtl mode to become "slide-from-left" transition. Right now I only came up with solution to reorder sections in html dom using javascript. Is there a simpler solution? 

Polymer 0.5

Thanks!

Best regards,

Roman Sorokin