please check it to make sure that I got it right.
Manually checking all the board boards in
Local section:
Türkçe (Turkish) board has...
<meta http-equiv="Content-Language" content="tr" />
Skandinavisk board has...
<meta http-equiv="Content-Language" content="da,no,sv" />
Română (Romanian) board has...
<meta http-equiv="Content-Language" content="ro" />
Pyccкий (Russian)<meta http-equiv="Content-Language" content="ru" />
Português (Portuguese)<meta http-equiv="Content-Language" content="pt" />
Polski<meta http-equiv="Content-Language" content="pl" />
Philippines<meta http-equiv="Content-Language" content="fl,en-PH" />
한국어 (Korean)<meta http-equiv="Content-Language" content="ko" />
Nederlands (Dutch)<meta http-equiv="Content-Language" content="nl" />
日本語 (Japanese)<meta http-equiv="Content-Language" content="ja" />
Italiano (Italian)<meta http-equiv="Content-Language" content="it" />
India<meta http-equiv="Content-Language" content="hi,en-IN" />
Français<meta http-equiv="Content-Language" content="fr" />
עברית (Hebrew)<meta http-equiv="Content-Language" content="he" />
Eλληνικά (Greek)<meta http-equiv="Content-Language" content="el" />
Deutsch (German)<meta http-equiv="Content-Language" content="de" />
Hrvatski (Croatian)<meta http-equiv="Content-Language" content="hr" />
中文 (Chinese)<meta http-equiv="Content-Language" content="zh" />
Español (Spanish)<meta http-equiv="Content-Language" content="es" />
Bahasa Indonesia (Indonesian)<meta http-equiv="Content-Language" content="id" />
العربية (Arabic)<meta http-equiv="Content-Language" content="ar" />
Crosscheck done and all the local boards1 has its desired language codes.
1 Could not find any language code on Other languages/locations and assume the reason is - there are no specific language.