Four Unicode fixes in discussion

While I've been working on edx/edx-platform#5309 and had roughly the following environment changes:

 - `LANGAUGE: 'ar'`
 - `PLATFORM_NAME: 'إدراك'` (Arabic/Unicode name)
 - RTL layout (should be irrelevant)
 - Possibly other Arabic/Unicode values all over the site

I've posted an Arabic thread, and it threw unicode encoding exceptions. Which I have solved by just adding `u` in front of four strings.