From PR #10960

Description of feature/enhancement

If a course has many students (or in general many responses per question), add extra loading text below the spinner to inform the user that the students are being loaded (after perhaps 5s).

Justification

From @dami

Currently our images are too big. The header image we're using is 4mb. Loading on mobile is slow.

Acceptance criteria:

• There are small, medium, and large versions of each image
• All images are compressed to the highest amount that does not affect human-eye quality
• Which size image is loaded is based on the screen size of the website user

In the near future, there may be different ima

We have openpose v1.5.1 submodule on our codebase, but recent release of Openpose v1.6.0 breaks our Docker build.

Error log:

Step 16/28 : RUN cmake /openpose && make -j 8 && make install
**OMITTED**
-- Found glog    (include: /usr/include, library: /usr/lib/x86_64-linux-gnu/libglog.so)
-- Found Protobuf: /usr/lib/x86_64-linux-gnu/libprotobuf.so;-lpthread (found version "3.0.0")
-- 

Forgot to implement the new PlatformAPI.for_organization method in the local API implementation (i.e. fake platform API for testing) in #904.

See #882 and #904 for details, it should be simple to implement.

LocalAPI is in the repobee_testhelpers.localapi module.

While the app does have an icon, never in the app itself is it used. this would be a great thing to fix in the future.