"Never to be forgotten", dodhearmadta is Irish (Gaelic). Scottish Gaelic: ?
"Gone but not forgotten" in Italian is "andato ma non dimenticato".
You need to specify Irish Gaelic or Scottish Gaelic: they are two separate languages.
I can not tell you this exactly as you want,The most close to this is: έφυγε αλλά δεν θα ξεχαστεί which means he\she is gone but he\she will not be forgotten.
Gone But Not Forgotten - 2005 TV is rated/received certificates of: Australia:M Netherlands:12 Portugal:M/12
The Titanic is gone but not forgotten.
Everything's Relative - 1987 Forgotten But Not Gone 1-7 was released on: USA: 1987
NFL Films Presents - 1967 Gone But Not Forgotten was released on: USA: 28 January 2013
Frasier - 1993 Forgotten But Not Gone 8-18 was released on: USA: 17 April 2001
The cast of Days Gone Not Forgotten - 2011 includes: Stacy Bloxsom as Punk girl Leila Laaraj as Lana
Frasier - 1993 Forgotten But Not Gone 8-18 is rated/received certificates of: Canada:PG (video rating)
My Favorite Martian - 1963 Gone But Not Forgotten 2-23 is rated/received certificates of: Australia:G
Fraggle Rock - 1983 Gone But Not Forgotten 5-7 is rated/received certificates of: Australia:G