Bug 1080828 - [Messages][RTL] International phone numbers and groupmms threads are not correctly displayed. r=julien

I have some doubts here (and below): ideally I'd have only one element here (```<p dir="auto">```, ```<span dir="auto">``` or ```bdi```). But in case with ```<p>``` only I guess we shouldn't have ```width: 100%``` to align content correctly, in case with only ```span``` or ```bdi``` we need to make some styling changes to preserve the same paddings\margins.

Soo, what do you think? :)