Here I got some Pictures to make it easy to understand:
Here I got the sign and as you can see it is in wrong direction, so I will rotate it.

Rotating...

After rotating is still wrong, it basicly says !TLAH TTIRTNIE !NETOBREV

This also happends with door textures, windows, roofs yes even walls, I cant basicly rotate textures, it wont do any change, but I can rotate objects...
Thanks so much for the help.