In the meantime, is it worth displaying English ads on relevant European Googles?
Native languages would be ideal - obviously - but in the interim just do it.
I tend to agree with Syzygy.
Because language and country targeting is a decision made on the campaign level, maybe you could consider creating a special campaign with the express purpose of running a limited test.
In addition to language and country targeting, at the campaign level of your accout you can also set a daily budget and end date in line with what you and your client are willing to invest in the experiment.
This would give you some hard data regarding how well the idea worked in your particular case, without a lot of risk.
AWA
NO good having a local language site, if you can not respond to calls/emails in that language (imo)
I have done a lot of stuff in Europe, but always in English, however have made the ad copy targeted.
eg:
Cheap Widgets to "Poland"
from a UK company
or
Cheap Widgets to Ukraine
from a UK company
the reason being that, a lot of people get campaign targeting wrong, ad user does not want to go to a site which does not service their country...
Shak
1. Always target the interface language(s) of that country + the English interface (that's because some people do tend to change the interface language)
2. If your site is in English, use only English keywords.
3. Don't use English keywords that are understood everywhere (hotel is a good example of a bad keyword if you target a non-english interface)
4. If people from a country different than your own types in English keywords, the add will display providing the search query matched the keyword (1), the targeted interface language (2) and the targeted country (3) (auto detected by IP)
This way, you're sure that the searcher is looking for info in English. You can obtain very good results by using this simple checklist!