Bangladesh picked an 18-man squad for their two-match Test series against South Africa in March-April on Thursday, with all-rounder Shakib Al Hasan and opener Tamim Iqbal returning. Shakib reportedly asked for leave to play in the Indian Premier League (IPL) tournament after missing Bangladesh’s previous Test series against New Zealand. However, he went unsold in the IPL auction, clearing the way for his return to Test cricket. Tamim, the opening batsman and one-day skipper, has also returned after missing the November home series against Pakistan and the January New Zealand tour due to injury…