Use 2-D, not 2D, in error messages. * libinterp/corefcn/cellfun.cc, libinterp/corefcn/ls-oct-ascii.cc, libinterp/octave-value/ov-bool-sparse.cc, libinterp/octave-value/ov-cx-sparse.cc, libinterp/octave-value/ov-re-sparse.cc, scripts/plot/private/__go_draw_axes__.m, scripts/polynomial/private/__splinefit__.m, scripts/sparse/svds.m, scripts/special-matrix/gallery.m: Use 2-D, not 2D, in error messages.