I suggest adding a "translator-credits" string to the po files so that all Xfce Apps will consistently have a "translator-credits" string to show the translators of the current language in the About dialog.
Sean Davis referenced this bugreport in commit aff52b3cf7b38da87d49d8dab3828319d4ac2a05 Add 'translator-credits' string to po files (bug #15564) https://git.xfce.org/apps/catfish/commit?id=aff52b3cf7b38da87d49d8dab3828319d4ac2a05
Thanks for the suggestion! Applied above.