Have I accidently deleted some files, and if so how can I replace them?

I’m not incredibly tech minded but I eventually got my Picade up and running with some roms and all works ok. However i think i may have messed something up (possible when trying to scrape some images?) and the front page for Mame now has some lines that just say unknown (see image below).
Anyone knows what should be here and if its possible to replace them?

Thanks in advance