#. tell the user that the file name provided by the X Direct Save source is invalid
#: ../thunar/thunar-standard-view.c:2549
Invalid filename provided by XDS drag site

Is this string intended for users? Then please rephrase and remove the reference to XDS (WTF? I'm using Linux since 2003, but never heard about this thing until now). If this is intended only for debugging, then there is no need to translate the string at all.