French translation missing strings

As of Mp3tag v2.93a, these are the untranslated strings for the French translation of Mp3tag.

/cc @BigBertrand and @cirruswazza

 _C_OPT_ADVANCED_LISTCHAPTERS List chapters as separate files
_C_OPT_MAPPING_SOURCE Source
_C_OPT_TAG Tags
_C_TT_TTT Tag - Tag
_C_WIZARD_TRACKS_DESC Assign track- and discnumbers
_C_WIZARD_TRACKS_DISC_BEGIN Begin at discnumber
_C_WIZARD_TRACKS_DISC_LEADINGZEROS Leading zeros for discnumbers (01, 02, ...)
_C_WIZARD_TRACKS_DISC_SAVETOTAL Save total count of discs
_C_WIZARD_TRACKS_DISCNUMBER Discnumber
_C_WIZARD_TRACKS_TRACKNUMBER Tracknumber
_M_STR_FIELDROWS Rows
_M_STR_MPEGBITRATE Bitrate
_M_STR_SIZE_NORMAL Normal
_M_STR_UPDATE_OPT_CHECK_RELEASENOTES Display release notes for new versions