I actually have translated the logbook onto an unofficial excel version, where all my totals are added up per aircraft/PIC/dual etc. I also bought an Ipad EASA approved logbook and will be copying entries soon, but I was worried.
Me too - Excel is a great tool. Excel printouts of my logbook, suitably certified as true copies, went to CAA for my last two rating changes instead of my handwritten logbook, without any trouble at-all. There are numerous versions out there in the public domain, but like you, I wrote my own to suit my needs.
Not something I feel the need for myself, but if you are living and working across the UK and France, you could easily have a single input source, then two different display pages, one in English and one in French?