* UK grocer Sainsbury has strong Xmas, own-brand sales surge * Germany DIY chain Praktiker misses forecasts, shares slide * EU economy shrinks in Q3, confidence at record low * European retail share index down almost 2 percent By Mark Potter LONDON, Jan 8 (Reuters) - Europe's shoppers are still switching to cheaper goods, despite policymakers' best efforts to revive growth, resulting in the best ever Christmas for British supermarket group J. Sainsbury, but hitting specialists like German DIY chain Praktiker. Consumers across the continent are cutting back on spending as banks rein in lending...
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