During the new Language installation you are facing with "NLS configuration missing for language <language code> (See SAP note 42305)" in SMLT at Classify Language phase.
This error is happening after you have successfully added, activated the needed Language codes in transaction I18n / RSCPINST (Language Configuration) and extented the Language lists as per SAP Notes:
An example with Estonian language (Language code ET):
"NLS configuration missing for language ET (See SAP note 42305)"
NLS configuration missing for language, See SAP note 42305, SMLT, Classify Language, CCC Cache, I18n, , KBA , BC-I18 , Internationalization (I18N) , BC-CTS-LAN , Language Transport Tools (application server ABAP) , Problem
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