ogr2ogr

ogr2ogr -overwrite -s_srs EPSG:31468 -t_srs Bing-Projection.txt bode_boundary_simp_bing_2.shp bode_boundary_simp.shp

ERROR 6: No translation for Mercator to PROJ.4 format is known.
Failed to create coordinate transformation between the
following coordinate systems.  This may be because they
are not transformable, or because projection services
(PROJ.4 DLL/.so) could not be loaded.
Source:
PROJCS["DHDN / 3-degree Gauss-Kruger zone 4",
    GEOGCS["DHDN",
        DATUM["Deutsches_Hauptdreiecksnetz",
            SPHEROID["Bessel 1841",6377397.155,299.1528128,
                AUTHORITY["EPSG","7004"]],
            TOWGS84[598.1,73.7,418.2,0.202,0.045,-2.455,6.7],
            AUTHORITY["EPSG","6314"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4314"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",12],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",4500000],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","31468"]]
Target:
PROJCS["Popular Visualisation CRS / Mercator",
    GEOGCS["Popular Visualisation CRS",
        DATUM["WGS84",
            SPHEROID["WGS84",6378137.0,298.257223563,
                AUTHORITY["EPSG","7059"]],
            AUTHORITY["EPSG","6055"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9102"]],
        AXIS["E",EAST],
        AXIS["N",NORTH],
        AUTHORITY["EPSG","4055"]],
    PROJECTION["Mercator"],
    PARAMETER["semi_minor",6378137],
    PARAMETER["False_Easting",0],
    PARAMETER["False_Northing",0],
    PARAMETER["Central_Meridian",0],
    PARAMETER["Latitude_of_origin",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["East",EAST],
    AXIS["North",NORTH],
    AUTHORITY["EPSG","3785"]]
ERROR 1: Terminating translation prematurely after failed
translation of layer bode_boundary_simp (use -skipfailures to skip errors)

I am running into the same problem. By any chance, did you fix this issue?