If you're using Office 365's Phish Alert Button (PAB) and you'd like to change the Phish Alert text to something else, you are able to.
How do I change the text? To do so, prior to installing the PAB into Office 365, download the Office 365 .xml manifest from your Account Settings in your console, open it in a text editor, and edit the following line of text:
<DisplayName DefaultValue="Phish Alert" />
The text shown in red is where you may enter a replacement for the text which says "Phish Alert" by default.
Then save the file, and install the Phish Alert Button as you normally would.
If you've already installed the PAB, you can follow the same steps as above. Simply remove your existing PAB add-in from Office 365, and then add the new .xml file you've edited as an Office 365 add-in. Your users will then see the PAB with the new wording that you've edited.
Having trouble locating your account settings? To locate your account settings, click your email address on the top right of the console, and click Account Settings. The .xml manifest is located under the Phish Alert Button header in your account settings.