FRANKFURT (Reuters) - Growth in Germany, Europe's biggest economy, will slow in the coming years, the Bundesbank said on Friday, cutting its forecasts in a biannual review after a string of disappointing data in recent months. For years the euro zone's powerhouse, Germany struggled unexpectedly in the second half 2018, suggesting that Europe's growth cycle is now past its peak and its rate of expansion will slow back towards what is considered its natural potential. "It is probable that..