(Reuters) - Technology stocks pushed European shares to three-week lows on Thursday after software firm SAP reported poor results, the latest company to warn about damage from protracted trade tensions as gloom about earnings spreads across global equities.Shares in Europe's most valuable tech company dove 6% after it said investors would have to wait till next year for a major improvement in margins as the business software group reported a 21% fall in quarterly operating profit.That added to..