student.html has no translations; needs expression_filter to be "h"

[OmarIthawi]

I just noticed that the student.html template needs an update. Here's the few problems I could spot in:

• It doesn't specifies <%page expression_filter="h"/>, which is needed for security
• It makes no use of gettext for translation, which is weird since it does have a ## Translators: ... note
• It's in Mako and could be converted to Django templates

The lines below are related to the issue:

https://github.com/edx/xblock-lti-consumer/blob/2fd330f8a62bc2fcc4951d546db5ca4920a5c1ec/lti_consumer/templates/html/student.html#L1-L4

[giovannicimolin]

@OmarIthawi I'm going to take a stab at converting this page to a Django template and fix the translations as part of my core contributor role.

[OmarIthawi]

Thank you @giovannicimolin!