Tags 864947 +patch Thanks
parl-desktop-world depends on firefox-esr-l10n-be which is no longer built by firefox-esr. I'm still trying to figure out where this is coming from, I can't find any evidence of it in the source package but rebuilding the binaries doesn't make it go away.
Ok, figured it out, the reference comes from boxer-data So to fix this bug requires an update to boxer-data followed by a (sourceful) rebuild of debian-parl. Patch for boxer-data is at http://debdiffs.raspbian.org/main/b/boxer-data/boxer-data_10.5.20%2brpi1.debdiff , once I have confirmed this mail is in the buglog I will clone/block.