Fix l10n display issues

Some small fix-ups for l10n so that things are accessible/readable. 

Main issue was checkbox was gone with truncated string because it was inside the label. This moves it out.
Secondly there were some small rtl issues.

Some long strings are still truncated assuming the trusted-ui width of 275x346 (I made a page to report the trusted-ui width so we are actually dealing with the correct width (that's with an inari on b2g 1.2)) so we might need to consider dropping text size programmatically to accommodate it if we want to avoid an ellipsis (desirable).