chore(i18n): Translated using Weblate (Serbian)

Currently translated at 0.7% (3 of 411 strings)

Translation: th-ch/youtube-music/i18n
Translate-URL: https://hosted.weblate.org/projects/youtube-music/i18n/sr/

Author: JellyBrick

src/i18n/resources/sr.json

@@ -1 +1,7 @@
-{}
+{
+  "language": {
+    "code": "sr",
+    "local-name": "Српски",
+    "name": "Serbian"
+  }
+}