Link description in portfolio section


I am using the Spice Press Pro theme, which I like very much. 

I need to customize the Starter Page however. In the Portfolio section, the Icon of a picture and of a link is shown, when you hover over the picture. For the link item, the tooltip "Appointment" is displayed, which is not very suitable for my purposes. How can I customize or remove this tooltip?

Thank you for help.


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