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Hello,
I see that the string "Please select Check-in and Check-out Dates and select the number of people per Chalet" inside the Pop-Up actually shows up as translated if I enable the option WPML > Strings Translation > Look for strings while pages are rendered.
I tried registering the string again but did not find a workaround for this problem in this case.
As this is a kind of complicated corner case, as WPML by default does not support editing original strings, I would suggest you keep using LocoTranslate for this task.