unescape escaped percentage signs in edxxml strings
unescape escaped percentage signs in edxxml strings

mitocw/latex2edx,evheubel/latex2edx,mitocw/latex2edx,evheubel/latex2edx,jefrench/latex2edx,jefrench/latex2edx,mitocw/latex2edx,evheubel/latex2edx,jefrench/latex2edx