Two views on what language to chose: The language most spoken in Europe: https://en.wikipedia.org/wiki/List_of_languages_by_number_of_speakers_in_Europe The language most spoken worldwide: https://en.wikipedia.org/wiki/List_of_languages_by_total_number_of_speakers
So it looks like it might be either German, Spanish or French, depending on how you would assess it. No surprises there. Now to convert everybody, not so easy ;-)
Two views on what language to chose: The language most spoken in Europe: https://en.wikipedia.org/wiki/List_of_languages_by_number_of_speakers_in_Europe The language most spoken worldwide: https://en.wikipedia.org/wiki/List_of_languages_by_total_number_of_speakers
So it looks like it might be either German, Spanish or French, depending on how you would assess it. No surprises there. Now to convert everybody, not so easy ;-)