For some reason, the migration path from unmanaged db (from alembic
point-of-view) to managed db, through the initial migration works well with
sqlite… But not with mysql where the db system tries to re-create the existing
tables.
This commit is a way to detect if we are migrating from pre-alembic era and
skip the first migration (which would do nothing anyway), marking it as already
executed.
It's quite hackish but that's the best I found so far to get it working with
both MySQL and SQLite.
Loading not versioned settings.py during tests make them less predictable.
That's inspired from django behaviour with DJANGO_SETTING_MODULE environment variable.
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
