MathQuill fix for RTL languages

[taniwallach]

MathQuill when used in an RTL language should still create the input boxes as LTR and the menu should internally be in LTR so the symbols will appear properly.

To test, open a problem (the blankProblem.pg is good enough).
Change the course language to he-il (you can add $language = 'he-il'; to the simple.conf file of the course, and then comment/uncomment that line when testing).

Before the patch:

1. The MathQuill toolbar (when in Hebrew) will be garbled:
   • the icons for roots and exponents are displayed wrong (sort of partially mirrored right-to-left).
2. Using those buttons or typing 4^5 or sqrt will get a messed up display inside the formatted input box.
3. Also 5! will get the factorial displayed on the left side of the 5.
4. Typing sin(5x) puts the argument on the left of the sin.

The patch tells rtlcss not to mirror the direction settings which were intended to prevent such problems.

After installing the patch you need to run npm install in /opt/webwork/pg/htdocs before checking that the fix works.

[drgrice1]

Looks good.

So you have time for a little testing now? That is good. Hopefully you are looking around the user interface for other things like this. The right-to-left styles have changed quite a bit, and I have only done minimal testing with this, partially due to not exactly knowing what to look for.