"Jamais Je Ne T'oublierai" is French for "I will never forget you". Google Translate get's it wrong by failing to pick up on the T' (T apostrophe), which is a contraction for "you". It is a line from the song A la Claire Fontaine, sung in the video, and the name of Episode 4 from Season 1 of Hell on Wheels. Just in case you were wondering.
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