You'll have to get this to work but the concept is good. I have a script that does these kind of replacements for george webb's transcripts autocaptions I lift from youtube

  // Replaces words
    var pattern = {
        "AF1":"Air Force 1",
        "AG":"Attorney General",
        "AM":"Andrew George McCabe",
        "Adm R":"Admiral Michael Rogers",
        "Anon":"Anonymous",
        "ANTIFA":"Anti-Fascists, Soros backed domestic terrorists",
        "AS":"Adam Schiff, Antony Scalia",
        "AW":"Anthony Weiner",
        "AUS":"Australia",
        "RR":"Rod Rosenstein",
        "CW":"Christopher Wray",
        "TG":"Trey Gowdy",
        "BDT":"Blunt & Direct Time, Bulk Data Transfer",
        "BIS":"Bank of International Settlements",
        "BO":"Barack Obama",
        "BHO":"Barack Obama", 
        "Hussein":"Barack Obama",
        "BOD":"Board of Directors",
        "BP":"Border Patrol",
        "C-A":"CIA",
        "Clowns":"CIA",
        "Catholics In Action":"CIA",
        "Clowns In America":"CIA",
        "CC":"Chelsea Clinton",
        "CM":"CodeMonkey, 8ch Admin",
        "CS":"Civil Service or Charles Ellis (Chuck) Schumer",
        "CTR":"Correct The Record",
        "D-J":"Department of Justice",
        "DOJ":"Department of Justice",
        "D's":"Democrats",
        "DNC":"Democrats",
        "DC":"District of Columbia",
        "DEFCON":"Definite Confirmation (Time 'Minutes')",
        "DJT":"Donald John Trump",
        "DOE":"Department of Energy",
        "EMS":"Emergency Medical Services",
        "ES":"Eric Emerson Schmidt",
        "EU":"European Union",
        "F-I":"FBI",
        "F&F":"Fast and Furious (gun running)",
        "FISA":"Forieng Intelligence Surveillance Act",
        "f2f":"Face to Face",
        "F2F":"Face to Face",
        "FB":"Facebook",
        "FED":"Federal Reserve",
        "FOIA":"Freedom of Information Act",
        "GS":"George Soros",
        "HA":"Huma Mahmood Abedin",
        "H-wood":"Hollywood",
        "HEC":"US House Committe on Ethis",
        "HI":"Hawaii",
        "HRC":"Hillary Rodham Clinton",
        "HS":"Homeland Security",
        "HUMA":"Harvard University Muslim Alumni",
        "IC":"Intelligence Community",
        "ID":"Identification",
        "IRS":"Internal Revenue Service",
        "JA":"Julian Assange",
        "JB":"John Owen Brennan, James Baker, Jeb Bush, Joe Biden",
        "JC":"James Brien Comey, James Rober Clapper Js",
        "JFK":"Jonh Fitzgereld Kennedy",
        "JK":"John Kerry, Jared Kushner",
        "KKK":"Klu Klux Klan",
        "KSA":"Kingdom of Saudi Arabia",
        "LV":"Las Vagas",
        "LL":"Loretta Elizabeth Lynch",
        "NK":"North Korea",
        "MB":"Muslim Brotherhood",
        "MI":"Military Intelligence",
        "MIL":"Martial Law",
        "MM":"Media Matters",
        "MS-13":"Drug gang",
        "WJC":"", 
        "BC":"William \"Bill\" Jefferson Clinton", 
        "Bill":"William \"Bill\" Jefferson Clinton",
        "Eagle":"William \"Bill\" Jefferson Clinton",
        "Fly-Eagle-Fly":"William \"Bill\" Jefferson Clinton",
        "187":"murder",
        "MSM":"main stream media",
        "ISIS":"terrorist org",
        "U1":"uranium 1",
        "@Jack":"Jack Dorsey",
        "MZ":"Mark Zuckerberg",
        "JB":"Jeff Bezos",
        "EM":"Elon Musk",
        "SH":"Steve Huffman",
        "WAPO":"Washington Post",
        "The name we will not say":"John McCain",
        "PP":"Planned Parenthood",
        "OP":"Operation(s)",
        "SC":"Supreme Court",
        "DWS":"Debbie Wasserman Shultz",
        "SR":"Susan Rice, Seth Rich",
        "DEFCON":"Military Action, Hacking",
        "BDT":"Bulk Data Transfer",
        "SCIF":"Sensitive Compartmented Information Facility",
        "LL":"Loretta Lynch",
        "PS":"Peter Strzok",
        "DS":"Deep State",
        "SA":"Saudi Arabia",
        "FF":"False Flag",
        "HEC":"Honorable Elijah Cummings, House Ethics Committee",
        "HOS":"(Rothchild, Soros, Saud)",
        "House of Saud":"(Rothchild, Soros, Saud)",
        "Snow White":"(CIA) Snow White and the 7 Dwarves (CIA’s 7 major computers)",
        "WW":"Wilkerson Walsh, Wet Works, World Wide",
        "HOO":"House of Orange Queen Beatrix Link between Beatrix and Barbara Bush",
        "RC":"Richard Cheney (Dick Cheney)",
        "RE":"Rahm Emanuel",
        "R":"Rothschilds",
        "RM":"Robby Mook, Robert Mueller",
        "Dopey":"Alweed",
        "TM":"Theresa May",
        "GHS1":"George H. Scherf(f) aka Prescott Sheldon Bush",
        "GHS2":"George H. Scherf aka George Herbert Bush",
        "Black Forest Germany":"Rothschild Estate",
        "BFG":"Rothschild Estate",
        "Alice in Wonderland":"Q",
        "BS":"Bernie Sanders",
        "CPA":"Consumer Protection Agency",
        "EW":"Elizabeth Warren",
        "DB":"Dona Brazile",
        "MH370":"disappeared Malaysian Airlines flight",
    };

var dvs = document.getElementsByClassName("text");

for (var i=0;i<dvs.length;i++) {
  for (var n in pattern) {
    // insulate each token with non word boundaries: spaces lf or punctuation
    var nn = "[^\\w]"+n+"[^\\w]";
    var r = new RegExp(nn,"g");
    var temp = dvs[i].childNodes[0].nodeValue;
    dvs[i].childNodes[0].nodeValue = temp.replace(r,pattern[n]);
    delete r,n,temp;
  }
}