feat(lang): translated using Weblate (Serbian)

Currently translated at 50.8% (630 of 1240 strings)

Co-authored-by: Hosted Weblate <hosted@weblate.org>
Co-authored-by: Milan Smudja <smudja@gmail.com>
Translate-URL: https://hosted.weblate.org/projects/overseerr/overseerr-frontend/sr/
Translation: Overseerr/Overseerr Frontend

src/i18n/locale/sr.json

@@ -438,7 +438,7 @@
   "components.Settings.Notifications.NotificationsWebhook.webhookUrl": "Webhook adresa",
   "components.ManageSlideOver.manageModalAdvanced": "Napredno",
   "components.ManageSlideOver.manageModalMedia": "Mediji",
-  "components.Settings.Notifications.NotificationsWebhook.customJson": "JSON Payload",
+  "components.Settings.Notifications.NotificationsWebhook.customJson": "JSON zadržaj",
   "components.Settings.SettingsLogs.label": "Labela",
   "components.Settings.SettingsLogs.level": "Ozbiljnost",
   "components.Settings.SettingsAbout.Releases.versionChangelog": "{version} Dnevnik promena",