Update install.rst
Do not show a button for creating a question or a pr assignment if there's already one of them created

The option of creating a peer review assignment or a question is not shown when
one of them already exists, as the classroom view does not handle KQs with both
a peer review and a question.
Use the weight in the teacher admin, instead of the normalized one
Merge pull request #32 from fid-jose/master

Allow creating only either a Question or a PR in a KQ
Add JS translations to the classroom view

They were being used but the lib wasn't being loaded
Remove useless console.log call
Removing Opentia copyright notices

According to the contract signed between the Opentia Group and the
Rooter Group, from now and for the existing developments done by Opentia
team will hold only the copyright of Rooter Analysis, S.L.
Merge branch 'master' into feature-assets
Use a button to toggle past events visibility