Update translation files from transifex

Also, commit incomplete languages as well
Small fix on CSS for workout renderer
Remove 'gym_config.json' from core fixtures

The same file is also in config/fixtures (where it belongs)
Update default user's fixture

The admin user is no longer a django super admin, but a regular user that
belongs to the different permission groups.
Simplify MANIFEST file

Add all files by default and only exclude what doesn't need to be included in
the package.
Don't pin the version of tastypie

This is not necessary anymore.
Generate 'install_requires' from requirements.txt

This reduces duplication of requirements
Group apps related to the REST API
Update download and changelog with current version
Set version to 1.5