Hi Slappy,
The textmechanic website has helped me more than once before. Although this is an old topic, I thought that it was worthwhile adding another option.
This is also possible via a regular expression find/replace (like GREP in InDesign), which only needs a single command.
Find:
(.+)(\n)
Replace:
'$1'
Note, there is a word space at the end of the replace text, which I have attempted to show with the underline.
Attached is a screenshot from the regex101 website (one of many regular expression sites out there).