New tag for RTL

[Shahar Or]

Dear friends,

There's a new tag in town and it's name is `rtl`. Whenever a bug which
messes with users of the right-to-left languages appears - the `rtl`
tag gets attached to it and the formidable RTL developers immediately
know what to do!

FYI, the relevant right-to-left languages are Arabic, Persian and
Hebrew. That's ar, fa and he.

So when someone mentions that a text is aligned to the wrong side,
words or letters are in reverse or that Evolution freezes when you
type "ש3." then please attach the RTL tag.

Thanks for reading.

Many blessings.