ÅÄÖ not supported in path creation

[c00k133]

Currently the letters å, ä, and ö results in unexpected behaviour. The symbols are not support by Unix paths, and thus the paths are created. However, they are supported by our database models. This means that, e.g., creating the path Årsfest would result in a database object being created and thus the path displayed on the page, but in a 404 Resource not found as the path does not exist.

Expected behaviour (2 options):

1. Allow the symbols to be part of the path name and hack around the actual path on the server
2. Disallow the symbols, but have both backend and frontend verification on the fields