Where are the values for replacement fields stored (e.g. privacymessage)?

Should be in the translation files - manual.limesurvey.org/Translating_LimeSurvey

Thank you, I found text in the PO file. However, each line of the privacy message has its own entry in the file. How does the system know which lines should be put into the {PRIVACYMESSAGE} replacement variable to create the entire message?

It's in /application/helpers/replacements_helper.php (around line 763), but be very careful hacking the core files.

Hi,

Without hacking core code : you can use privacy.pstpl in your template.

Denis