Need to set correct mime type for Gimp palette files
When uploading a gpl file (for which my 'file --mime-type' command tells me it's 'text/plain') into the palette category, the new form-checking javascript says it's not 'text/plain'.
Which mime type do I need to add (as acceptable type) for that category, so users don't have to rename their file as '.gpl.txt'? I.e. which mime type does javascript find there?