TYPO3 hreflang-Links via Sprach-Menü

lib.hreflang

lib.hreflang = HMENU
lib.hreflang {
  special = language
  special.value = 0,1,2
  1 = TMENU
  1 {
    # Link zu nicht-aktiven Sprachen anzeigen
    NO = 1
    NO {
      stdWrap.cObject = TEXT
      stdWrap.cObject.value = de || en || fr
      linkWrap = <link rel="alternate" hreflang="|
      doNotLinkIt = 1
      after.cObject = TEXT
      after.cObject {
        stdWrap {
          wrap = " href="|" />
          typolink {
            parameter.data = TSFE:id
            additionalParams = &L=0 || &L=1 || &L=2
            returnLast = url
            forceAbsoluteUrl = 0
            addQueryString = 1
            addQueryString.method = GET
            addQueryString.exclude = cHash,backPid
          }
        }
      }
    }
    # Link zur gerade aktiven Sprache NICHT anzeigen
    #ACT = 1
    #ACT.doNotShowLink = 1
    # Link zu fehlenden Übersetzungen NICHT anzeigen
    USERDEF1 = 1
    USERDEF1.doNotShowLink = 1
  }
}