Dear Irish Forum speakers: Please, I ask for your help in the  following manner. I need these three lines in Irish triple checked for accuracy, as it will be for a Irish tattoo. I would also like these lines translates or written into (SL), the old Irish language, if possible.
Thank you so much for your time, I know it is valuable.
Here are the English lines , followed  by the first translation to Irish, that I need three votes for accuracy on. It would probably be easier to just respond to my
Gmail account:
ericbeecroft1974@gmail.com
( though I will of course look on this Irish forum page)

Lyrics:

We'll shine like stars in the summer night...
Lonroídh muid mar réalta oíche shamhraidh

We'll shine like stars in the winter night...
Lonroídh muid mar réalta oíche gheimhridh

One heart...one hope...one love
Croí amhaín...dóchas amhaín...grá amhaín

lonróidh (not: lonroídh)

- réalta = singular; "stars", plural = réaltaí.
- oíche gheimhridh/shamhraidh = "on a winter('s)/summer('s) night". "In the winter/summer night" = san oíche geimhridh/samhraidh.
- It should be amháin, not amhaín
- Lonróidh muid can also be written Lonróimid (more compact and cheaper for tattoos).

By "the old Irish language", are you sure you don't mean the old decorative script? If it's the old script you want, any 'h' is omitted and a dot/full stop/period placed over the preceding letter.