NEW YORK — The day after Donald Trump’s election in November 2016, the American Civil Liberties Union posted a message to him on its website: “See you in court.”As president, Trump hasn’t personally squared off against the ACLU from the witness stand, but the broader warning has been borne out. As of this week, the ACLU has filed nearly 400 lawsuits and other legal actions against the Trump administration, some meeting with setbacks but many resulting in important victories.Among other successes for the ACLU, it prevailed …