Language SettingsWithin a Google Suite account, it is possible to change your default language. To change your settings go to myaccount.google.com and switch to your preferred language.
While there are many languages available not all are there yet. Languages are being updated all the time so do send feedback to Google about requiring your language and make sure you check back regularly.
Adding MacronsIf you're not able to have your own language as a default you can still add things like macrons fairly easily in most Google Tools. One option is to use special characters just like you would in other word processing programs. Basically click the Insert menu then special characters, draw your character and it will be inserted wherever your cursor is located.
Another way of adding macrons is to use an add on for Goog…