typoscript condition language
#checking language using languageid
[siteLanguage("languageId") == 1]
your code
[GLOBAL]
#checking language using locale
[siteLanguage("locale") == "en_US.UTF-8"]
your code
[GLOBAL]
#checking language using hreflang
[siteLanguage("hreflang") == "en-US"]
your code
[GLOBAL]