Remove unneeded text-left classes and RTL hacks

The text-left wasn't doing anything useful, and it was
breaking RTL display of message documentation. This commit
removes all its use.

It also removes unneeded hacks with classes 'rtl' and 'ltr'.

Change-Id: I2553cba5fdbd4963b543a72493eacdbbe1319268
Merge "Remove unneeded text-left classes and RTL hacks"