My site is translated into 8 different languages (english, spanish, portuguese, german, french, italian, dutch and russian). All language versions of the website share the same Adsense data-ad-slot ID.
When trying to set a new custom channel as a targetable ad placement, there is an obligatory field called Site language.
Do i have to create custom channels as a targetable ad placements for each language? If not, how will the advertiser know the exact language version in which their ads will be displayed on?
I really don't want to end up creating a new ad unit for each language and size (i use 728x90, 160x600 and 336x280). That would mean having 24 ad units instead of just 3.