--Euro struggles to build on its gains despite robust data from China and Germany --Spain and the EFSF treasury bill auctions are well-received --Sterling broadly unmoved as weak inflation data increases scope for more quantitative easing LONDON (Dow Jones)--The euro was mostly firmer in European trade Tuesday, underpinned by solid German and Chinese economic data, but it struggled to make much headway against the dollar as the euro zone crisis continued to weigh on investor confidence. Better-than-expected growth data for China got the session off to a positive start and propelled the Australian dollar to an 11-week high above $1.04 ...

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