per , there are several mobile-ready courses that have translated transcripts, but no doc yet on how/whether they can be accessed in the mobile app.
See
DemoX
https://courses.edx.org/courses/SMES/PSYCH101x/1T2015/courseware/f3763236185c4c41ac182ad823e70b64/5e6428fae8ed446ba4ca1f07f80bc9c1/