* Add a @requires_admin decorator
It can be used to protect specific endpoints with ADMIN_PASSWORD
(a password that is stored unencrypted in the settings)
The decorator has no effect if ADMIN_PASSWORD is an empty string (default value)
* Require admin permissions to access create project endpoint
When ADMIN_PASSWORD is not empty, project creation form on the
home page will be replaced by a link to the create project endpoint
so one is able to enter the admin password before filling the form
The only translation so far is french, but more can be added. The browser language
is used thanks to the HTTP languages headers.
There are still some problems with the translation of some strings, I don't know
why this is. See #12
This commit adds:
* support for projects (creation not yet finished)
* an authentication mechanism
* bugs (basically all the features are not working anymore)
