Drop opinionated settings for PWA

• Base URLs are set to / in PWA's default settings anyway
  • With https://github.com/silviolleite/django-pwa/pull/32 merged, the defaults will work under all circumstances without changing settings
• l10n/i18n assumptions should not be made. PWA will see another MR to enabled it to use the language settings used in Django

Closes #140 (closed).

changed milestone to %2.0a1

added part::backend type::bug labels

mentioned in commit 44947554

merged