function logRemoval(alreadyLoggedPrunes, messageId, reason) {
  if (alreadyLoggedPrunes.has(messageId)) return;

  console.log(`Removing message\n\t'${messageId}'\nfrom translations: ${reason}.`);
  alreadyLoggedPrunes.add(messageId);
}
Logs a message as removed if it hasn't been logged before.
@param {Set<string>} alreadyLoggedPrunes
@param {string} messageId
@param {string} reason