Fix configlet schema

- Use ASCIILine instead of TextLine for weather_api_key field
- Update i18n
Update Brazilian Portuguese and Spanish translations
Fix named utilities to avoid errors if no API key was entered

Clarify debugging information.

Refs. https://github.com/collective/collective.weather/issues/20
Refs. https://github.com/collective/collective.weather/issues/43
Remove z3c.autoinclude.plugin and update package dependencies
Update package documentation
pep8/pyflakes