Add links between login and registration forms.

Signed-off-by: Simon Luijk <simon@simonluijk.com>
Translate base templates.

Signed-off-by: Simon Luijk <simon@simonluijk.com>
LANGUAGE_CODE should one of LANGUAGES.

Signed-off-by: Simon Luijk <simon@simonluijk.com>
Dynamically set LANGUAGE_CODE to first in LANGUAGES.

Conflicts:
	core/settings.py (FIXED)

Signed-off-by: Simon Luijk <simon@simonluijk.com>