At the top of the dialog two labels "Description" and "Signed by" are shown. These are intended to be only in the UI file for translation, they are used in the table header later. They should be set invisible.
Samuel Mehrbrodt committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=1478f81f236b88377293432a642def218e228145 tdf#105637 Digital signatures dialog has unnessary labels It will be available in 5.4.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Samuel Mehrbrodt committed a patch related to this issue. It has been pushed to "libreoffice-5-3": http://cgit.freedesktop.org/libreoffice/core/commit/?id=75c305ad1cff7f4a4cae97e02297e7f1fbddab44&h=libreoffice-5-3 tdf#105637 Digital signatures dialog has unnessary labels It will be available in 5.3.1. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.