fix: restore automatic language flags

SELF_HOSTING.md

@@ -100,7 +100,9 @@ The Next.js image cache is separate and may be discarded safely.
   up/down controls. Entry IDs are stable URL identifiers and cannot be renamed
   through the editor after creation.
 - **Languages:** add a lowercase language tag such as `de`, `ar`, or `pt-br`, a
-  native display name, and text direction. English and Persian labels are built
+  native display name, and text direction. Flags are automatic; optionally set
+  `Flag country` to a lowercase country code (for example `gb` or `us`) to override
+  the inferred region. Unknown regions show a globe. English and Persian labels are built
   in. Other labels fall back to English until translated. Named placeholders
   such as `{title}` and `{current}` must be retained.
 - **Media library:** upload JPEG, PNG, WebP, or PDF files, up to 10 MB each.