Fixed typo on line 707, missing quote prevented button link functionality
Fixed typo on line 707, missing quote prevented button link functionality

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