The phrase "when translated from Gaelic to English" indicates that a text, word, name, or passage originally composed in a Gaelic language (Irish Gaelic, Scottish Gaelic, or Manx) has been rendered into English.
This applies to anything from:
Gaelic languages are Celtic (Goidelic branch), distinct from English (Germanic). Translation involves not just vocabulary but cultural concepts, idioms, and grammatical structures with no direct English equivalents.