main.lua

local modDirectory = g_currentModDirectory

function overwriteGameplayHints()
  -- remove the existing hints
  g_gameplayHintManager.gameplayHints = {}

  -- open your own hints xml file
  local xmlFile = loadXMLFile("gameplayHints", Utils.getFilename("maps/gameplayHints.xml", modDirectory))

  -- loop through all the entries and feed them to the gameplayManager
  local i = 0
  while true do
      local key = string.format("gameplayHints.gameplayHint(%d)", i)
      if not hasXMLProperty(xmlFile, key) then
          break
      end

      local text = getXMLString(xmlFile, key)
      if text:sub(1,6) == "$l10n_" then
          text = g_i18n:getText(text:sub(7))
      end
      table.insert(g_gameplayHintManager.gameplayHints, text)

      i = i + 1
  end
  
  -- remove the entry to the xml file
  delete(xmlFile)

  g_mpLoadingScreen.currentGameplayHints = nil
end

function load(mission)
  overwriteGameplayHints()
end

function init()
  -- Loading of your own hints needs to happen after the basegame initializes, but before the mission is loaded
  Mission00.load = Utils.prependedFunction(Mission00.load, load)
end

init()