Here is an example, with its screenshot pasted below. You will see that while the fawiki page is, correctly, in RTL the output of MassMessage is in LTR. In fact, the <div> tag that is generated by MassMessage is specifically overriding both the directionality and the language parameters, both of which are wrong: <div id="mw-content-text" class="mw-content-ltr" lang="en">