UPDATE: MAY 5 2015
Please note that the content in this article focuses on a legacy version of the iPerceptions code, and as such may no longer be applicable. To learn more about our Universal Code, please check out this section of our support forum, as well as this article for more information on setting invitation rates for projects which use the iPerceptions Universal Code.
You can set different invitation rates for the different language versions of your survey within the "Adjust Invitation Rate" page on the iPerceptions portal. However, if you would like to set the exact same invitation rates for Desktop, Tablet and Mobile for all language versions of your survey, selecting "ALL Languages" within the "Select Language" drop-down menu would allow you to do so all at once, as opposed to setting invitation rates for the different languages one at a time.
Make sure to save your changes before leaving the page to ensure that your invitation rate changes are applied.