Both Scharnhorst and Gneisenau had their straight stems replaced with the 'Atlantic Stem' in the late 30s. It was designed to improve sea keeping qualities over the bow.
Also, all of the image links are broken...some sort glitch, but it may be on my part, since I'm accessing remotely.
Scharnhorst and Gneisenau were both classfied as battlecruisers (Japan did the same thing with the Kongo class of battleships, but much earlier), as it was intended to upgrade their main guns during a refit that was supposed to occur in 1941-42, but the start of the war prevented this from happening.
Jeff Herne