By Matthias Williams and Kate Abnett BERLIN/BRUSSELS (Reuters) -Austria said on Monday it is seeking to enlist other European Union countries to oppose labelling investment in gas and nuclear power as “green”. Vienna on Friday filed a legal challenge against the EU’s inclusion of the energy sources on a list of climate-friendly investments, spotlighting divisions that have hit the bloc during an energy crisis made worse by war in Ukraine. Luxembourg has already voiced its support for Austria and others may follow, Austrian Environment Minister Leonore Gewessler told a news briefing, without na…