Implement tag models

See merge request funkwhale/funkwhale!814

Fixed typo in source translation

See merge request funkwhale/funkwhale!821

Resolve "Add a "Replace current playlist" option"

See merge request funkwhale/funkwhale!820

Fix #877: Ensure API urls answer with and without a trailing slash

Closes #877

See merge request funkwhale/funkwhale!817

Custom css

See merge request funkwhale/funkwhale!818

Resolve "Provide a default format when transcoding via Subsonic"

See merge request funkwhale/funkwhale!819

Front-end minor fixes / error handling

See merge request !816

Fixed flaky tests because of license cache

See merge request !815

Pressing return on searchbar to search for artists

See merge request !812

Human readable stats

See merge request !811

Broken pytest

See merge request !813

Resolve "Broken link to artist page in album and track header"

See merge request funkwhale/funkwhale!809

Resolve "Provide a default format when transcoding via Subsonic"

See merge request funkwhale/funkwhale!807

Fix #867: Added a SUBSONIC_DEFAULT_TRANSCODING_FORMAT env var to support clients that don't provide the format parameter

Resolve "Cannot edit users details"

See merge request funkwhale/funkwhale!808

Added opus to supported mimetymes and extensions

See merge request funkwhale/funkwhale!806