By Thomas Escritt BERLIN (Reuters) – Promising to rescue Germany from the far right, a new leftist party offered up a populist recipe of high pensions, low defence spending and an end to expensive climate policies in its first outing ahead of regional and European elections this year. The Sahra Wagenknecht Alliance (BSW), named after its leader, a popular former leader of the Left party, held its first national congress on Saturday, with delegates turning their fire on the entire political spectrum from left to right. With the far-right Alternative for Germany (AfD) gaining around 20% support …