Allow automatic instance redirect to be turned off

Instead the "switch invidious instance" link would bring users to
redirect.invidious.io

locales/sr.json

@@ -86,6 +86,8 @@
     "dark": "",
     "light": "",
     "Thin mode: ": "",
+    "Miscellaneous preferences": "",
+    "Automatically redirect to another Instance: ": "",
     "Subscription preferences": "",
     "Show annotations by default for subscribed channels: ": "",
     "Redirect homepage to feed: ": "",