DONETSK/SLOVYANSK, Ukraine, July 17 (Reuters) – In one of his first acts as Ukrainian president, comedian-turned-politician Volodymyr Zelenskiy held out a symbolic olive branch to people in Ukraine’s mostly Russian-speaking Donbass region, by switching from Ukrainian to Russian. Language was a factor in the outbreak of the conflict in 2014, with Russian speakers in Donbass saying they feared Kiev would impose the Ukrainian language on them.