Resolve "ensure important urls are not broken"

I made two changes. One is the deletion of all trailing slashes on the URLs. This way, all URLs have the same syntax (which wasn't the case until now) and it corresponds as well to the design in the legacy code. I edited as well the app and apps URLs in order to reach every related view by both apps or webapps. This comes from the legacy URL design that authorized that.

Closes #249 (closed)