By Karolos Grohmann BERLIN, April 19 (Reuters) – Though the Bundesliga has become a two-horse race between Borussia Dortmund and Bayern Munich in recent seasons, fears that it might suffer the fate of Spain are unfounded, Dortmund boss Hans-Joachim Watzke said on Friday. Champions League semi-finalists Dortmund, who take on Spain’s Real Madrid on Wednesday in the first leg, won back-to-back Bundesliga titles in 2011 and 2012 before surrendering the trophy to fellow semi-finalists Bayern this season. …