set default test locale into :de to prevent different test outcomes for different locales which are set by rspec randomly
set default test locale into :de to prevent different test outcomes for different locales which are set by rspec randomly

Signed-off-by: zaziemo <5403f6f38eacf386c1e08de2cd81eeb52b5c370b@gmail.com>

BriocheBerlin/speakerinnen_liste,acid/speakerinnen_liste,BriocheBerlin/speakerinnen_liste,Techylite/speakerinnen_liste,acid/speakerinnen_liste,nerdinand/speakerinnen_liste,1000miles/speakerinnen_liste,1000miles/speakerinnen_liste,rubymonsters/speakerinnen_liste,Techylite/speakerinnen_liste,rubymonsters/speakerinnen_liste,1000miles/speakerinnen_liste,Techylite/speakerinnen_liste,nerdinand/speakerinnen_liste,acid/speakerinnen_liste,BriocheBerlin/speakerinnen_liste,rubymonsters/speakerinnen_liste,nerdinand/speakerinnen_liste