Listenbrainz scrobbling (#1424)

* Refactor session_keys to its own package

* Adjust play_tracker

- Don't send external NowPlaying/Scrobble for tracks with unknown artist
- Continue to the next agent on error

* Implement ListenBrainz Agent and Auth Router

* Implement frontend for ListenBrainz linking

* Update listenBrainzRequest

- Don't marshal Player to json
- Rename Track to Title

* Return ErrRetryLater on ListenBrainz server errors

* Add tests for listenBrainzAgent

* Add tests for ListenBrainz Client

* Adjust ListenBrainzTokenDialog to handle errors better

* Refactor listenbrainz.formatListen and listenBrainzRequest structs

* Refactor agent auth_routers

* Refactor session_keys to agents package

* Add test for listenBrainzResponse

* Add tests for ListenBrainz auth_router

* Update ListenBrainzTokenDialog and auth_router

* Adjust player scrobble toggle

ui/src/i18n/en.json

@@ -95,7 +95,8 @@
                 "createdAt": "Created at",
                 "changePassword": "Change Password?",
                 "currentPassword": "Current Password",
-                "newPassword": "New Password"
+                "newPassword": "New Password",
+                "token": "Token"
             },
             "helperTexts": {
                 "name": "Changes to your name will only be reflected on next login"
@@ -104,6 +105,10 @@
                 "created": "User created",
                 "updated": "User updated",
                 "deleted": "User deleted"
+            },
+            "message": {
+                "listenBrainzToken": "Enter your ListenBrainz user token.",
+                "clickHereForToken": "Click here to get your token"
             }
         },
         "player": {
@@ -116,7 +121,7 @@
                 "userName": "Username",
                 "lastSeen": "Last Seen At",
                 "reportRealPath": "Report Real Path",
-                "scrobbleEnabled": "Send Scrobbles to Last.fm"
+                "scrobbleEnabled": "Send Scrobbles to external services"
             }
         },
         "transcoding": {
@@ -306,7 +311,11 @@
         "lastfmLinkSuccess": "Last.fm successfully linked and scrobbling enabled",
         "lastfmLinkFailure": "Last.fm could not be linked",
         "lastfmUnlinkSuccess": "Last.fm unlinked and scrobbling disabled",
-        "lastfmUnlinkFailure": "Last.fm could not unlinked",
+        "lastfmUnlinkFailure": "Last.fm could not be unlinked",
+        "listenBrainzLinkSuccess": "ListenBrainz successfully linked and scrobbling enabled as user: %{user}",
+        "listenBrainzLinkFailure": "ListenBrainz could not be linked: %{error}",
+        "listenBrainzUnlinkSuccess": "ListenBrainz unlinked and scrobbling disabled",
+        "listenBrainzUnlinkFailure": "ListenBrainz could not be unlinked",
         "openIn": {
             "lastfm": "Open in Last.fm",
             "musicbrainz": "Open in MusicBrainz"
@@ -325,7 +334,8 @@
                 "language": "Language",
                 "defaultView": "Default View",
                 "desktop_notifications": "Desktop Notifications",
-                "lastfmScrobbling": "Scrobble to Last.fm"
+                "lastfmScrobbling": "Scrobble to Last.fm",
+                "listenBrainzScrobbling": "Scrobble to ListenBrainz"
             }
         },
         "albumList": "Albums",