Fix #834: Simplified embedded docker reverse proxy IP configuration

Closes #834

See merge request funkwhale/funkwhale!779

Fix #851: wrong og:image url when using S3 storage

See merge request funkwhale/funkwhale!777

Fix #848: Fixed invalid file extension for transcoded tracks

See merge request funkwhale/funkwhale!776

Fix #850: Ensure empty but optional fields in file metadata don't error during import

See merge request funkwhale/funkwhale!775

Develop cherry pick

See merge request funkwhale/funkwhale!774

Fix websockets reverse proxy

See merge request funkwhale/funkwhale!773

Fix French translation for "Start radio"

See merge request funkwhale/funkwhale!772

Added username and domain filter on /history/listenings endpoint

See merge request funkwhale/funkwhale!771

Add new translations, fix en_GB

Closes #846, #845, and #844

See merge request funkwhale/funkwhale!769

Added some documentation about translations lifecycle

See merge request funkwhale/funkwhale!770

Currently translated at 100.0% (879 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/ru/

Currently translated at 100.0% (879 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/pt_BR/

Currently translated at 100.0% (649 of 649 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/en_GB/

Currently translated at 100.0% (879 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/pt_BR/

Currently translated at 100.0% (879 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/it/

Currently translated at 83.6% (735 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/ar/

Currently translated at 83.4% (733 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/ar/

Currently translated at 83.2% (731 of 879 strings)

Translation: Funkwhale/Funkwhale's server front-end
Translate-URL: https://translate.funkwhale.audio/projects/funkwhale/front/ar/

Resolve "Hovering volume button changes player's height"

Closes #838

See merge request !768

Resolve "Add documentation for resolver conf"

Closes #840

See merge request !767