How should we handle a forward slash "/" in new file and rename dialogs?

[Emmanuel Pescosta]

> -_- i wanted to fix that!

Ok no problem ;) If you want, you can fix the problems in kdelibs (New
File Dialog) and in Dolphin (Rename Dialog)

Inline-Renaming is almost fixed ;) https://git.reviewboard.kde.org/r/107139/

I will remove the "New File Dialog" and "Rename Dialog" related stuff
from my review request

Have fun!! ;)