Adding symbols such as Maori Macrons

Maori language macrons and other accents and symbols can be found in the rich text editor.

If you edit the page and click on the "omega" /  (insert symbol) icon  Ώ in the rich text editor icons, then in the dropdown field choose the Latin Extended-A option, you will see all the options you can choose to make the letters look as follows:
ā ē ō ū

The following is an image of what you'll see once you've clicked on the Omega / insert symbol icon and selected Latin Extended-A: