I installed stringoverride on a site running D6.12, added 3 rows of strings to override (which works great!), and then exported the rows to a file.

Here are the contents of that file:

# String Overrides Exportmsgid "No components yet in this webform."
msgstr "No questions yet in this survey."
msgid "The new webform %title has been created. Add new fields to your webform with the form below."
msgstr "The new survey %title has been created. Add new questions to your survey with the form below."
msgid "This webform is currently unpublished. After finishing your changes to the webform, use the <em>Publish</em> button below."
msgstr "This survey is currently unpublished. After finishing your changes to the survey, use the <em>Save Changes</em> button below."

There seems to be a missing line break between the 1st and 2nd line.