Remove archive for category

Hello.
I have 2 questions.
I’m using MDTF to sort by categories and tags.
1. (bigger issue). When I use the filter for categories, my result page title becomes “Archive for category: “category name””. When i sort by tags the title becomes “Tag archive: “tag name”. How can I remove the Archive part and leave only the category/tag name?
2. Is it possible to put a message on 1 of the categories? The website is for a Pastry and i’m preparing to add “Available Today” category. I want to add a message that the available things are listed on the start of the work day, and it is possible that they will be sold out by the end of it.
Thanks in advance!