'Una Forever In Infinite' is the translation of 'Together Forever In Eternity' in Latin. Forever doesn't have any change.
In Latin, How Is The Phrase, "Together Forever In Eternity" Spelled Out?
Semper coniuncti in aeternum
Explanation:
"In aeternum" is much more common, the kind of expression a Latin would use. And I prefer to use an adjective or "past participle", coniuncti, rather than "conjuctim", ad adverb, since I suppose it is a couple of lovers, and coniuncti would express the fact that they are united, whereas conjuctim would express that they do things jointly.
Examples of use on Internet:
, Fas In Aeternum, Fas Ite In Aeternum
Adoremus in Aeternum Sanctissimum Sacramentum.
In te, Domine, speravi: Non confundar in aeternum
Explanation:
"In aeternum" is much more common, the kind of expression a Latin would use. And I prefer to use an adjective or "past participle", coniuncti, rather than "conjuctim", ad adverb, since I suppose it is a couple of lovers, and coniuncti would express the fact that they are united, whereas conjuctim would express that they do things jointly.
Examples of use on Internet:
, Fas In Aeternum, Fas Ite In Aeternum
Adoremus in Aeternum Sanctissimum Sacramentum.
In te, Domine, speravi: Non confundar in aeternum
Maybe you should google it. Also at office depot they sell translation programs.