use the lang parameter with the appropriate language code, e.g. [[File:Chinapop.svg|lang=en]] for the English version. Do not specify a lang parameter if
File:Chinapop.svg is a vector version of this file. It should be used in place of this PNG file when not inferior. File:China population pyramid 2005.png
File:Chinapop.svg is a vector version of this file. It should be used in place of this PNG file when not inferior. File:Pyramide Chine.PNG → File:Chinapop