What's Changed
* Add translation coverage to the documentation by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1174
* Add JSON examples to the documentation site by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1175
* Fix a bug where Wikipedia page names were not sufficiently quoted during HTTP requests by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1177
* Fix an erroneous permanent redirect and add Vary response headers in the nginx configuration by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1176
* Make content negotiation implicit by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1180
* Document the data model by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1187
* Allow sitemaps to scale beyond 50,000 URLs by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1189
* Embed the nginx extension's Lua code in its assets by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1190
* Show inherited members in the API documentation by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1192
* Refactor the gramps tests and remove a risky shared testing fixture by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1191
* Ensure all configuration classes have initializer arguments for all their values by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1193
* Add Twitter card support by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1194
* Allow maps to be displayed fullscreen by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1148
* Fix all pydocstyles D100 violations by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1195
* Fix Leaflet.js markers not showing due to incorrect URLs by bartfeenstra in https://github.com/bartfeenstra/betty/pull/1196
**Full Changelog**: https://github.com/bartfeenstra/betty/compare/0.3.0b8...0.3.0b9