The character to indicate a mnemonic with VCL widgets is ~, not _. I didn’t notice this because it was working fine with the GTK plugin, presumably because it ends up accepting either character internally. The previous string was copied from a UI file where the mnemonic character does need to be _. Now that the string has changed I’ve changed the context too because it will end up as a new string for translators now anyway. Change-Id: I5e52926ea4cdfd50bed6dda5d4cd6a5a5f550b4f Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211226 Reviewed-by: Neil Roberts <nroberts@libreoffice.org> Tested-by: Jenkins