feat(oauth): limited discord server sign-in (#346)

* feat(oauth): limited discord server sign-in

* fix: typo

* style: change undefined to optional

* style: remove conditional operator

frontend/src/i18n/translations/en-US.ts

@@ -472,6 +472,8 @@ export default {
   "admin.config.oauth.microsoft-client-secret.description": "Client secret of the Microsoft OAuth app",
   "admin.config.oauth.discord-enabled": "Discord",
   "admin.config.oauth.discord-enabled.description": "Whether Discord login is enabled",
+  "admin.config.oauth.discord-limited-guild": "Discord limited server ID",
+  "admin.config.oauth.discord-limited-guild.description": "Limit signing in to users in a specific server. Leave it blank to disable.",
   "admin.config.oauth.discord-client-id": "Discord Client ID",
   "admin.config.oauth.discord-client-id.description": "Client ID of the Discord OAuth app",
   "admin.config.oauth.discord-client-secret": "Discord Client secret",
@@ -496,10 +498,13 @@ export default {
   "error.msg.default": "Something went wrong.",
   "error.msg.access_denied": "You canceled the authentication process, please try again.",
   "error.msg.expired_token": "The authentication process took too long, please try again.",
+  "error.msg.invalid_token": "Internal Error",
   "error.msg.no_user": "User linked to this {0} account doesn't exist.",
   "error.msg.no_email": "Can't get email address from this {0} account.",
   "error.msg.already_linked": "This {0} account is already linked to another account.",
   "error.msg.not_linked": "This {0} account haven't linked to any account yet.",
+  "error.msg.unverified_account": "This {0} account is unverified, please try again after verification.",
+  "error.msg.discord_guild_permission_denied": "You are not allowed to sign in.",
   "error.param.provider_github": "GitHub",
   "error.param.provider_google": "Google",
   "error.param.provider_microsoft": "Microsoft",